Name: Shuichi Sekiguchi
Country: Japan
Birthdate: 15.07.91, 32 years
ATP ranking: 635
TOP ranking's position: 259 (05.05.14, 184 points)
Points: 51
Prize money: 212127 $
Matches total: 685
Win: 406
%: 59.27 %
Country: Japan
Birthdate: 15.07.91, 32 years
ATP ranking: 635
TOP ranking's position: 259 (05.05.14, 184 points)
Points: 51
Prize money: 212127 $
Matches total: 685
Win: 406
%: 59.27 %
| year | summary | Hard | Clay | I. hard | Carpet | Grass | Acrylic |
| 2023 | 23/15 | 22/14 | 0/0 | 1/1 | 0/0 | 0/0 | 0/0 |
| 2022 | 28/14 | 28/14 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2021 | 1/9 | 1/6 | 0/0 | 0/3 | 0/0 | 0/0 | 0/0 |
| 2020 | 6/6 | 5/4 | 1/1 | 0/1 | 0/0 | 0/0 | 0/0 |
| 2019 | 55/23 | 48/19 | 0/0 | 0/1 | 1/1 | 6/2 | 0/0 |
| 2018 | 18/19 | 12/9 | 3/7 | 0/1 | 3/2 | 0/0 | 0/0 |
| 2017 | 33/27 | 30/21 | 1/1 | 0/2 | 2/3 | 0/0 | 0/0 |
| 2016 | 54/31 | 45/26 | 3/1 | 4/2 | 2/2 | 0/0 | 0/0 |
| 2015 | 35/21 | 34/18 | 0/0 | 0/2 | 1/1 | 0/0 | 0/0 |
| 2014 | 26/21 | 24/18 | 0/0 | 0/1 | 2/2 | 0/0 | 0/0 |
| 2013 | 51/26 | 39/22 | 10/0 | 0/1 | 2/3 | 0/0 | 0/0 |
| 2012 | 36/24 | 28/21 | 0/1 | 5/0 | 0/1 | 3/1 | 0/0 |
| 2011 | 18/23 | 5/8 | 7/11 | 0/0 | 3/3 | 3/1 | 0/0 |
| 2010 | 20/15 | 17/10 | 2/2 | 0/0 | 0/2 | 0/0 | 1/1 |
| 2009 | 2/4 | 1/2 | 1/1 | 0/0 | 0/0 | 0/1 | 0/0 |
| 2008 | 0/1 | 0/1 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 |
| TOTAL | 406/279 | 339/213 | 28/25 | 10/15 | 16/20 | 12/5 | 1/1 |
| perc. % | 59.27 % | 61.41 % | 52.83 % | 40 % | 44.44 % | 70.59 % | 50 % |
Shuichi Sekiguchi / scheduled / last
| no matches found |
Shuichi Sekiguchi form / surface: Hard
Shuichi Sekiguchi / surface: Hard
| 12.10.23 | 2nd round | Kokoro Isomura | Shuichi Sekiguchi | 6-4, 4-6, 6-3 |  | match details |  M25 Cairns | Hard |
| 10.10.23 | 1st round | Shuichi Sekiguchi | Tomislav Edward Papac | 6-4, 6-3 |  | match details | ||
| 16.09.23 | 1/2 | Kazuki Nishiwaki | Shuichi Sekiguchi | 0-6, 7-5, 6-4 | | match details |  M25 Sapporo | Hard |
| 16.09.23 | 1/4 | Shuichi Sekiguchi | Hikaru Shiraishi | 6-2, 4-6, 6-3 | | match details | ||
| 15.09.23 | 2nd round | Shuichi Sekiguchi | Jumpei Yamasaki | 6-3, 7-5 | | match details | ||
| 13.09.23 | 1st round | Shuichi Sekiguchi | Ryota Tanuma | 7-62, 6-1 | | match details | ||
| 10.09.23 | fin | Shuichi Sekiguchi | Daisuke Sumizawa | 6-1, 6-4 | | match details | M25 Sapporo | Hard |
| 09.09.23 | 1/2 | Shuichi Sekiguchi | Naoki Nakagawa | 5-7, 6-3, 7-5 | | match details | ||
| 08.09.23 | 1/4 | Shuichi Sekiguchi | Jumpei Yamasaki | 6-4, 6-3 | | match details | ||
| 07.09.23 | 2nd round | Shuichi Sekiguchi | Chase Ferguson | 6-2, 6-2 | | match details | ||
| 05.09.23 | 1st round | Shuichi Sekiguchi | Hiroki Sakagawa | 6-3, 6-2 | | match details | ||
| 28.08.23 | qual. | Jie Cui | Shuichi Sekiguchi | 6-1, 6-2 | | match details |  Zhangjiagang Challenger | Hard |
| 27.08.23 | q 1 | Shuichi Sekiguchi | Francis Casey Alcantara | 7-5, 6-3 | | match details | ||
| 22.08.23 | 1st round | Dominik Palan | Shuichi Sekiguchi | 7-60, 5-7, 6-2 | | match details | Zhuhai Challenger | Hard |
| 21.08.23 | qual. | Shuichi Sekiguchi | Markos Kalovelonis | 7-61, 2-6, 6-4 | | match details | ||
| 05.08.23 | 1/2 | Yusuke Takahashi | Shuichi Sekiguchi | 6-4, 6-4 | | match details |  M25 Astana | Hard |
| 04.08.23 | 1/4 | Shuichi Sekiguchi | Egor Agafonov | 7-61, 6-1 | | match details | ||
| 03.08.23 | 2nd round | Shuichi Sekiguchi | S D Prajwal Dev | 6-75, 7-5, 6-0 | | match details | ||
| 02.08.23 | 1st round | Shuichi Sekiguchi | Ajeet Rai | 6-2, 6-1 | | match details | ||
| 24.07.23 | 1st round | Khumoun Sultanov | Shuichi Sekiguchi | 7-65, 6-4 | | match details | Astana Challenger | Hard |
| 07.07.23 | 1/4 | Maximus Jones | Shuichi Sekiguchi | 6-4, 6-73, 7-5 | | match details |  M15 Nakhon | Hard |
| 06.07.23 | 2nd round | Shuichi Sekiguchi | Taisei Ichikawa | 6-2, 6-2 | | match details | ||
| 05.07.23 | 1st round | Shuichi Sekiguchi | Credit Chaiyarin | 6-2, 6-4 | | match details | ||
| 28.06.23 | 1st round | Moerani Bouzige | Shuichi Sekiguchi | 7-5, 6-3 | | match details |  M15 Jakarta | Hard |
| 23.06.23 | 1/4 | Fitriadi M Rifqi | Shuichi Sekiguchi | 0-6, 6-3, 7-65 | | match details | M15 Jakarta | Hard |
| 22.06.23 | 2nd round | Shuichi Sekiguchi | Thiemo de Bakker | 1-6, 6-1, 3-1, Thiemo de Bakker - retired | | match details | ||
| 21.06.23 | 1st round | Shuichi Sekiguchi | Tegar Abdi Satrio Wibowo | 6-0, 6-0 | | match details | ||
| 06.04.23 | 2nd round | Jea Moon Lee | Shuichi Sekiguchi | Shuichi Sekiguchi - walk over | | match details | M25 Kashiwa | Hard |
| 05.04.23 | 1st round | Shuichi Sekiguchi | Tatsuma Ito | 4-6, 6-3, 7-5 | | match details | ||
| 22.03.23 | 1st round | Karan Singh | Shuichi Sekiguchi | 6-3, 6-4 | | match details |  M25 Lucknow | Hard |
| 16.03.23 | 2nd round | Yunseok Jang | Shuichi Sekiguchi | 2-6, 7-5, 6-3 | | match details | M25 New | Hard |
| 15.03.23 | 1st round | Shuichi Sekiguchi | Woobin Shin | 5-7, 7-5, 6-3 | | match details | ||
| 09.02.23 | 2nd round | Adam Walton | Shuichi Sekiguchi | 6-1, 6-73, 7-63 | | match details | M25 Burnie | Hard |
| 08.02.23 | 1st round | Shuichi Sekiguchi | Corey Gaal | 6-2, 7-5 | | match details | ||
| 01.02.23 | 2nd round | Adam Walton | Shuichi Sekiguchi | 6-3, 6-2 | | match details | Burnie Challenger | Hard |
| 30.01.23 | 1st round | Shuichi Sekiguchi | Dane Sweeny | 6-2, 6-4 | | match details | ||
| 22.11.22 | 1st round | Sho Shimabukuro | Shuichi Sekiguchi | 6-4, 6-3 | | match details | Yokkaichi Challenger | Hard |
| 21.11.22 | qual. | Shuichi Sekiguchi | Jason Jung | 5-1, Jason Jung - retired | | match details | ||
| 20.11.22 | q 1 | Shuichi Sekiguchi | Chak Lam Coleman Wong | 6-2, 6-1 | | match details | ||
| 08.11.22 | 1st round | Koki Matsuda | Shuichi Sekiguchi | 6-74, 7-64, 3-2, Shuichi Sekiguchi - retired | | match details | Matsuyama Challenger | Hard |
| 07.11.22 | qual. | Shuichi Sekiguchi | Makoto Ochi | 7-5, 7-5 | | match details | ||
| 06.11.22 | q 1 | Shuichi Sekiguchi | Beibit Zhukayev | 4-6, 6-3, 7-63 | | match details | ||
| 09.09.22 | 1/4 | Shintaro Imai | Shuichi Sekiguchi | 6-3, 6-0 | | match details | M25 Sapporo | Hard |
| 08.09.22 | 2nd round | Shuichi Sekiguchi | Taki Adachi | 6-3, 6-0 | | match details | ||
| 07.09.22 | 1st round | Shuichi Sekiguchi | Masamichi Imamura | 7-64, 1-6, 6-0 | | match details | ||
| 04.09.22 | fin | Rio Noguchi | Shuichi Sekiguchi | 4-6, 7-5, 6-2 | | match details | M25 Sapporo | Hard |
| 03.09.22 | 1/2 | Shuichi Sekiguchi | Yuki Mochizuki | 0-6, 6-2, 6-3 | | match details | ||
| 02.09.22 | 1/4 | Shuichi Sekiguchi | Daisuke Sumizawa | 7-63, 7-61 | | match details | ||
| 01.09.22 | 1st round | Shuichi Sekiguchi | Yusuke Takahashi | 6-1, 6-74, 6-2 | | match details | ||
| 01.09.22 | 2nd round | Shuichi Sekiguchi | Kento Takeuchi | 6-2, 6-4 | | match details | ||
| 24.08.22 | 1st round | Geni Inoue | Shuichi Sekiguchi | 3-6, 6-3, 6-4 | | match details |  M15 Changwon | Hard |
| 09.07.22 | 1/2 | Zachary Svajda | Shuichi Sekiguchi | 4-6, 6-1, 6-0 | | match details |  M15 Fountain | Hard |
| 08.07.22 | 1/4 | Shuichi Sekiguchi | Yuta Kikuchi | 7-65, 6-4 | | match details | ||
| 07.07.22 | 2nd round | Shuichi Sekiguchi | Austin Ansari (USA) | 2-6, 6-1, 6-1 | | match details | ||
| 06.07.22 | 1st round | Shuichi Sekiguchi | Jacob Bullard | 6-3, 6-3 | | match details | ||
| 01.07.22 | 1/4 | Omni Kumar | Shuichi Sekiguchi | 7-65, 7-65 | | match details | M25 Dallas | Hard |
| 30.06.22 | 2nd round | Shuichi Sekiguchi | Yibing Wu | 1-6, 5-5, Yibing Wu - retired | | match details | ||
| 29.06.22 | 1st round | Shuichi Sekiguchi | Marcus Walters | 6-3, 6-2 | | match details | ||
| 23.06.22 | 2nd round | Ryan Shane | Shuichi Sekiguchi | 6-3, 6-2 | | match details | M15 South | Hard |
| 22.06.22 | 1st round | Shuichi Sekiguchi | Aditya Vashist | 7-5, 6-2 | | match details | ||
| 15.06.22 | 1st round | Yuta Shimizu | Shuichi Sekiguchi | 3-6, 6-3, 6-2 | | match details | M25 Wichita | Hard |
| 29.05.22 | fin | Shuichi Sekiguchi | Simon Anthony Ivanov | 6-3, 6-1 | | match details |  M15 Heraklion | Hard |
| 28.05.22 | 1/2 | Shuichi Sekiguchi | Mark Whitehouse | 6-4, 6-2 | | match details | ||
| 27.05.22 | 1/4 | Shuichi Sekiguchi | Stefanos Sakellaridis | 7-66, 6-1 | | match details | ||
| 26.05.22 | 2nd round | Shuichi Sekiguchi | Marlon Vankan | 6-3, 1-0, Marlon Vankan - retired | | match details | ||
| 25.05.22 | 1st round | Shuichi Sekiguchi | Gabriele Bosio | 3-6, 6-4, 6-0 | | match details | ||
| 21.05.22 | 1/2 | Omar Jasika | Shuichi Sekiguchi | 6-4, 6-2 | | match details | M15 Heraklion | Hard |
| 20.05.22 | 1/4 | Shuichi Sekiguchi | Hugo Pontico | 6-1, 6-0 | | match details | ||
| 19.05.22 | 2nd round | Shuichi Sekiguchi | Kelsey Stevenson | 6-0, 6-3 | | match details | ||
| 18.05.22 | 1st round | Shuichi Sekiguchi | Matic Dimic | 6-0, 6-0 | | match details | ||
| 13.05.22 | 1/4 | Colin Markes | Shuichi Sekiguchi | 6-3, 3-6, 6-3 | | match details | M15 Heraklion | Hard |
| 12.05.22 | 2nd round | Shuichi Sekiguchi | Sebastian Dominko | 7-60, 6-1 | | match details | ||
| 10.05.22 | 1st round | Shuichi Sekiguchi | Matthew Dellavedova | 6-4, 6-2 | | match details | ||
| 01.04.22 | 1/4 | Dominik Boehler | Shuichi Sekiguchi | 4-6, 6-4, 7-5 | | match details |  M15 Sharm | Hard |
| 31.03.22 | 2nd round | Shuichi Sekiguchi | Karlo Cubelic | 6-4, 7-66 | | match details | ||
| 30.03.22 | 1st round | Shuichi Sekiguchi | Sahar Simon | 7-62, 6-1 | | match details | ||
| 25.03.22 | 1st round | Adria Soriano Barrera | Shuichi Sekiguchi | 5-7, 6-4, 10-5 | | match details |  M25 Quinta | Hard |
| 17.03.22 | 1st round | Hady Habib | Shuichi Sekiguchi | 6-0, 6-4 | | match details | M25 Loule | Hard |
| 04.08.21 | 1st round | Alfredo Perez | Shuichi Sekiguchi | 6-1, 7-61 | | match details | M25 Decatur | Hard |
| 26.07.21 | 1st round | Ulises Blanch | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Lexington Challenger | Hard |
| 19.07.21 | 1st round | Christian Harrison | Shuichi Sekiguchi | 6-4, 6-4 | | match details | Cary Challenger | Hard |
| 27.04.21 | 1st round | Pedro Sakamoto | Shuichi Sekiguchi | 6-2, 6-4 | | match details |  Salinas 2 | Hard |
| 21.04.21 | 2nd round | Nicolas Jarry | Shuichi Sekiguchi | 6-1, 6-2 | | match details | Salinas Challenger | Hard |
| 19.04.21 | 1st round | Shuichi Sekiguchi | Hiroki Moriya | 6-1, 7-65 | | match details | ||
| 12.04.21 | q 1 | Altug Celikbilek | Shuichi Sekiguchi | 4-6, 6-4, 7-5 | | match details | Orlando Challenger | Hard |
| 03.10.20 | 1/4 | Gastao Elias | Shuichi Sekiguchi | 6-2, 6-3 | | match details | M25 Porto | Hard |
| 01.10.20 | 2nd round | Shuichi Sekiguchi | Patrik Niklas-Salminen | 3-6, 6-2, 6-3 | | match details | ||
| 30.09.20 | 1st round | Shuichi Sekiguchi | Sadio Doumbia | 6-4, 7-66 | | match details | ||
| 31.01.20 | 1/4 | Matija Pecotic | Shuichi Sekiguchi | 6-2, 7-5 | | match details | M25 Nonthaburi | Hard |
| 30.01.20 | 2nd round | Shuichi Sekiguchi | Jung-Woong Na | 6-1, 6-4 | | match details | ||
| 29.01.20 | 1st round | Shuichi Sekiguchi | Kasidit Samrej | 6-3, 6-2 | | match details | ||
| 22.01.20 | 2nd round | Peter Polansky | Shuichi Sekiguchi | 6-3, 7-5 | | match details | Bangkok Challenger | Hard |
| 21.01.20 | 1st round | Shuichi Sekiguchi | Viktor Galovic | 6-3, 3-0, Viktor Galovic - retired | | match details | ||
| 11.01.20 | q 1 | Tatsuma Ito | Shuichi Sekiguchi | 6-3, 4-6, 6-4 | | match details |  Auckland | Hard |
| 04.01.20 | 1/2 | Luke Saville | Shuichi Sekiguchi | 6-3, 6-3 | | match details | M15 Te | Hard |
| 02.01.20 | 1/4 | Shuichi Sekiguchi | George Stoupe | 6-3, 6-1 | | match details | ||
| 02.01.20 | 2nd round | Shuichi Sekiguchi | Calum Puttergill | 2-6, 6-2, 6-2 | | match details | ||
| 31.12.19 | 1st round | Shuichi Sekiguchi | Sam Ryan Ziegann | 6-2, 6-3 | | match details | ||
| 14.11.19 | 3rd round | Roberto Ortega-Olmedo | Shuichi Sekiguchi | 6-2, 6-4 | | match details | Pune Challenger | Hard |
| 12.11.19 | 2nd round | Shuichi Sekiguchi | Roman Blokhin | 6-3, 6-0 | | match details | ||
| 31.10.19 | 3rd round | Marc Polmans | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Playford Challenger | Hard |
| 29.10.19 | 2nd round | Shuichi Sekiguchi | Matthew Christopher Romios | 6-3, 6-1 | | match details | ||
| 24.10.19 | 3rd round | Yasutaka Uchiyama | Shuichi Sekiguchi | 6-4, 3-6, 7-5 | | match details | Traralgon Challenger | Hard |
| 22.10.19 | 2nd round | Shuichi Sekiguchi | Dayne Kelly | 6-4, 2-6, 7-67 | | match details | ||
| 14.10.19 | 1st round | Ji Sung Nam | Shuichi Sekiguchi | 6-1, 6-1 | | match details | Ningboo Challenger | Hard |
| 11.10.19 | 1/4 | Daniel Nguyen | Shuichi Sekiguchi | 5-1, Shuichi Sekiguchi - retired | | match details |  M25 Tay | Hard |
| 10.10.19 | 2nd round | Shuichi Sekiguchi | Kento Takeuchi | 5-5, Kento Takeuchi - retired | | match details | ||
| 08.10.19 | 1st round | Shuichi Sekiguchi | Sidharth Rawat | 6-0, 6-1 | | match details | ||
| 12.09.19 | 3rd round | Yasutaka Uchiyama | Shuichi Sekiguchi | 6-4, 6-3 | | match details | Shanghai Challenger | Hard |
| 11.09.19 | 2nd round | Shuichi Sekiguchi | Saketh-Sai Myneni | 4-6, 6-3, 7-64 | | match details | ||
| 09.09.19 | 1st round | Shuichi Sekiguchi | Jacob Grills | 3-6, 6-1, 6-1 | | match details | ||
| 04.09.19 | 2nd round | Akira Santillan | Shuichi Sekiguchi | 6-1, 6-2 | | match details | Jinan Challenger | Hard |
| 03.09.19 | 1st round | Shuichi Sekiguchi | Mukund Sasikumar | 6-3, 6-3 | | match details | ||
| 08.08.19 | 3rd round | Tung-Lin Wu | Shuichi Sekiguchi | 6-4, Shuichi Sekiguchi - retired | | match details | Yokkaichi Challenger | Hard |
| 07.08.19 | 2nd round | Shuichi Sekiguchi | Ze Zhang | 3-6, 7-65, 7-5 | | match details | ||
| 06.08.19 | 1st round | Shuichi Sekiguchi | Kousuke Ogura | 6-1, 6-3 | | match details | ||
| 02.08.19 | 1/4 | Tatsuma Ito | Shuichi Sekiguchi | 6-2, 6-1 | | match details | Chengdu Challenger | Hard |
| 01.08.19 | 3rd round | Shuichi Sekiguchi | Goncalo Oliveira | 6-4, 3-6, 6-4 | | match details | ||
| 31.07.19 | 2nd round | Shuichi Sekiguchi | Tsung-Hua Yang | 6-4, 6-4 | | match details | ||
| 29.07.19 | 1st round | Shuichi Sekiguchi | Wei Qiang Zheng | 7-5, 6-1 | | match details | ||
| 18.07.19 | 3rd round | Egor Gerasimov | Shuichi Sekiguchi | 6-2, 6-0 | | match details | Nur Sultan | Hard |
| 16.07.19 | 2nd round | Shuichi Sekiguchi | Zhizhen Zhang | 7-5, 6-4 | | match details | ||
| 15.07.19 | 1st round | Shuichi Sekiguchi | Dostanbek Tashbulatov | 6-3, 6-1 | | match details | ||
| 19.06.19 | 2nd round | Tomas Barrios Vera | Shuichi Sekiguchi | Shuichi Sekiguchi - walk over | | match details |  Fergana Challenger | Hard |
| 17.06.19 | 1st round | Shuichi Sekiguchi | Makoto Ochi | 6-4, 6-4 | | match details | ||
| 09.06.19 | fin | Shintaro Imai | Shuichi Sekiguchi | 6-2, 6-1 | | match details |  M25 Hong | Hard |
| 08.06.19 | 1/2 | Shuichi Sekiguchi | Yuki Mochizuki | 6-3, 7-63 | | match details | ||
| 07.06.19 | 1/4 | Shuichi Sekiguchi | Yusuke Takahashi | 6-3, 6-3 | | match details | ||
| 06.06.19 | 2nd round | Shuichi Sekiguchi | Xin Gao | 6-3, 6-1 | | match details | ||
| 04.06.19 | 1st round | Shuichi Sekiguchi | Wai Yu Kai | 6-2, 6-1 | | match details | ||
| 31.05.19 | 1/4 | Rio Noguchi | Shuichi Sekiguchi | 7-5, 5-7, 6-1 | | match details | M25 Nonthaburi | Hard |
| 30.05.19 | 2nd round | Shuichi Sekiguchi | Chayanon Kaewsuto | 6-2, 5-7, 6-4 | | match details | ||
| 29.05.19 | 1st round | Shuichi Sekiguchi | Adil Kalyanpur | 7-64, 6-4 | | match details | ||
| 26.05.19 | fin | Shuichi Sekiguchi | Ji Sung Nam | 6-1, 6-4 | | match details | M25 Nonthaburi | Hard |
| 25.05.19 | 1/2 | Shuichi Sekiguchi | Harry Bourchier | 6-4, 6-4 | | match details | ||
| 24.05.19 | 1/4 | Shuichi Sekiguchi | Kelsey Stevenson | 7-65, 6-2 | | match details | ||
| 23.05.19 | 2nd round | Shuichi Sekiguchi | Jayden Court | 6-4, 6-1 | | match details | ||
| 21.05.19 | 1st round | Shuichi Sekiguchi | Sonchat Ratiwatana | 7-5, 6-0 | | match details | ||
| 12.05.19 | fin | Yan Bai | Shuichi Sekiguchi | 6-2, 6-4 | | match details | M25 Wuhan | Hard |
| 11.05.19 | 1/2 | Shuichi Sekiguchi | Wishaya Trongcharoenchaikul | 7-68, 7-5 | | match details | ||
| 10.05.19 | 1/4 | Shuichi Sekiguchi | Tyler Lu | 6-1, 6-0 | | match details | ||
| 09.05.19 | 2nd round | Shuichi Sekiguchi | Hong Kit Wong | 6-2, 6-3 | | match details | ||
| 08.05.19 | 1st round | Shuichi Sekiguchi | Sora Fukuda | 2-6, 6-3, 4-0, Sora Fukuda - retired | | match details | ||
| 05.05.19 | fin | Shuichi Sekiguchi | Sho Shimabukuro | 6-3, 6-0 | | match details | M15 Wuhan | Hard |
| 04.05.19 | 1/2 | Shuichi Sekiguchi | Kuan-Yi Lee | 6-3, 6-3 | | match details | ||
| 02.05.19 | 2nd round | Shuichi Sekiguchi | Alexander Crnokrak | 7-5, 6-2 | | match details | ||
| 02.05.19 | 1/4 | Shuichi Sekiguchi | Ti Chen | Ti Chen - walk over | | match details | ||
| 01.05.19 | 1st round | Shuichi Sekiguchi | Chenhe Li | 6-4, 6-3 | | match details | ||
| 15.04.19 | fin | Shuichi Sekiguchi | Takuto Niki | 6-4, 6-4 | | match details | M25 Matsuyama | Hard |
| 13.04.19 | 1/2 | Shuichi Sekiguchi | Seong Chan Hong | 6-2, 6-3 | | match details | ||
| 12.04.19 | 1/4 | Shuichi Sekiguchi | Naoki Tajima | 6-4, 6-4 | | match details | ||
| 12.04.19 | 2nd round | Shuichi Sekiguchi | Issei Okamura | 6-1, 6-0 | | match details | ||
| 09.04.19 | 1st round | Shuichi Sekiguchi | Ryota Tanuma | 6-4, 6-4 | | match details | ||
| 03.04.19 | 1st round | Takuto Niki | Shuichi Sekiguchi | 2-6, 6-3, 7-65 | | match details | M15 Kashiwa | Hard |
| 17.03.19 | fin | Seong Chan Hong | Shuichi Sekiguchi | 7-64, 6-4 | | match details | M15 Nishi | Hard |
| 16.03.19 | 1/2 | Shuichi Sekiguchi | Takuto Niki | 6-4, 6-76, 6-3 | | match details | ||
| 15.03.19 | 1/4 | Shuichi Sekiguchi | Shintaro Imai | 6-3, 6-0 | | match details | ||
| 14.03.19 | 2nd round | Shuichi Sekiguchi | Yuki Mochizuki | 6-2, 6-1 | | match details | ||
| 13.03.19 | 1st round | Shuichi Sekiguchi | Keisuke Saitoh | 6-3, 6-2 | | match details | ||
| 06.01.19 | 1st round | Viktor Durasovic | Shuichi Sekiguchi | 6-3, 6-2 | | match details | Da Nang | Hard |
| 02.01.19 | 1st round | Carlos Boluda-Purkiss | Shuichi Sekiguchi | 7-5, 6-4 | | match details | M25 Hong | Hard |
| 24.10.18 | 2nd round | Filip Bergevi | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Vietnam F4 | Hard |
| 23.10.18 | 1st round | Shuichi Sekiguchi | Billy Harris | 7-63, 4-6, 7-67 | | match details | ||
| 06.07.18 | 1/4 | Min-Kyu Song | Shuichi Sekiguchi | 6-2, 6-1 | | match details | China F9 | Hard |
| 05.07.18 | 2nd round | Shuichi Sekiguchi | Chenhe Li | 6-2, 7-5 | | match details | ||
| 03.07.18 | 1st round | Shuichi Sekiguchi | Lingxi Zhao | 6-2, 6-0 | | match details | ||
| 22.06.18 | 1/4 | Enrique Lopez-Perez | Shuichi Sekiguchi | 6-2, 4-0, Shuichi Sekiguchi - retired | | match details | Fergana Challenger | Hard |
| 20.06.18 | 2nd round | Shuichi Sekiguchi | Ivan Nedelko | Ivan Nedelko - walk over | | match details | ||
| 19.06.18 | 1st round | Shuichi Sekiguchi | Jose Statham | 1-6, 7-65, 6-2 | | match details | ||
| 18.06.18 | qual. | Shuichi Sekiguchi | Roman Safiullin | 6-4, 2-6, 6-4 | | match details | ||
| 17.06.18 | q 2 | Shuichi Sekiguchi | Altug Celikbilek | 6-2, 6-1 | | match details | ||
| 16.06.18 | q 1 | Shuichi Sekiguchi | Gerard Granollers | 6-1, 6-4 | | match details | ||
| 08.05.18 | 1st round | Aldin Setkic | Shuichi Sekiguchi | 6-1, 7-5 | | match details | Karshi Challenger | Hard |
| 07.05.18 | qual. | Shuichi Sekiguchi | N. Vijay Sundar Prashanth | 6-74, 6-4, 7-62 | | match details | ||
| 06.05.18 | q 2 | Shuichi Sekiguchi | Yaraslav Shyla | 3-6, 6-1, 6-2 | | match details | ||
| 05.05.18 | q 1 | Shuichi Sekiguchi | Mikhail Fufygin | 4-6, 6-4, 6-1 | | match details | ||
| 29.04.18 | q 2 | Ji Hoon Son | Shuichi Sekiguchi | 6-2, 7-63 | | match details | Seoul Challenger | Hard |
| 26.03.18 | 1st round | Jacob Grills | Shuichi Sekiguchi | 7-64, 4-6, 6-3 | | match details | Japan F4 | Hard |
| 22.03.18 | 2nd round | Sho Katayama | Shuichi Sekiguchi | 7-5, 4-6, 6-2 | | match details | Japan F3 | Hard |
| 19.03.18 | 1st round | Shuichi Sekiguchi | Jumpei Yamasaki | 6-78, 7-63, 6-2 | | match details | ||
| 12.03.18 | 1st round | Seong Chan Hong | Shuichi Sekiguchi | 6-4, 1-6, 7-62 | | match details | Japan F2 | Hard |
| 23.02.18 | q 1 | Hiroki Moriya | Shuichi Sekiguchi | 6-2, 6-4 | | match details | Yokohama Challenger | Hard |
| 15.10.17 | q 2 | Yunseong Chung | Shuichi Sekiguchi | 6-4, 6-3 | | match details | Ningboo Challenger | Hard |
| 19.09.17 | 1st round | Tsung-Hua Yang | Shuichi Sekiguchi | 7-5, 7-64 | | match details | Gwangju Challenger | Hard |
| 14.09.17 | 2nd round | Yibing Wu | Shuichi Sekiguchi | 5-0, Shuichi Sekiguchi - retired | | match details | Shanghai Challenger | Hard |
| 12.09.17 | 1st round | Shuichi Sekiguchi | Alexander Kudryavtsev | 4-6, 6-4, 6-2 | | match details | ||
| 07.09.17 | 2nd round | Mohamed Safwat | Shuichi Sekiguchi | 6-75, 6-1, 6-3 | | match details | Zhangjiagang Challenger | Hard |
| 05.09.17 | 1st round | Shuichi Sekiguchi | Kento Takeuchi | 6-4, 6-3 | | match details | ||
| 09.08.17 | 2nd round | Evgeny Donskoy | Shuichi Sekiguchi | 6-2, 6-3 | | match details | Jinan Challenger | Hard |
| 07.08.17 | 1st round | Shuichi Sekiguchi | N. Vijay Sundar Prashanth | 6-4, 6-4 | | match details | ||
| 01.08.17 | 1st round | Yunseong Chung | Shuichi Sekiguchi | 4-6, 6-3, 7-5 | | match details | Chengdu Challenger | Hard |
| 29.07.17 | 1/2 | Nikola Milojevic | Shuichi Sekiguchi | 6-4, 6-0 | | match details | China F14 | Hard |
| 28.07.17 | 1/4 | Shuichi Sekiguchi | Karunuday Singh | 6-3, 7-63 | | match details | ||
| 26.07.17 | 2nd round | Shuichi Sekiguchi | Zhaoyi Cao | 6-4, 6-2 | | match details | ||
| 25.07.17 | 1st round | Shuichi Sekiguchi | Kuan-Yi Lee | 6-4, 2-4, Kuan-Yi Lee - retired | | match details | ||
| 20.07.17 | 2nd round | Alexander Bublik | Shuichi Sekiguchi | 6-3, 7-5 | | match details | Astana Challenger | Hard |
| 18.07.17 | 1st round | Shuichi Sekiguchi | Dzmitry Zhyrmont | 6-2, 1-6, 6-3 | | match details | ||
| 21.06.17 | 2nd round | Ilya Ivashka | Shuichi Sekiguchi | 6-2, 6-2 | | match details | Fergana Challenger | Hard |
| 19.06.17 | 1st round | Shuichi Sekiguchi | Vladyslav Manafov | 6-4, 3-6, 7-5 | | match details | ||
| 13.06.17 | 1st round | Tung-Lin Wu | Shuichi Sekiguchi | 6-4, 6-2 | | match details | .png){kind=small} Chinese Taipei | Hard |
| 08.06.17 | 1/4 | Yosuke Watanuki | Shuichi Sekiguchi | 6-4, 5-7, 6-0 | | match details | Japan F7 | Hard |
| 07.06.17 | 2nd round | Shuichi Sekiguchi | Yuki Matsuo | 6-4, 6-2 | | match details | ||
| 04.06.17 | 1st round | Shuichi Sekiguchi | Hiroyasu Ehara | 6-2, 6-1 | | match details | ||
| 09.05.17 | 1st round | Duckhee Lee | Shuichi Sekiguchi | 6-0, 6-3 | | match details | Seoul Challenger | Hard |
| 08.05.17 | qual. | Shuichi Sekiguchi | Lloyd Glasspool | 6-3, 6-3 | | match details | ||
| 07.05.17 | q 2 | Shuichi Sekiguchi | Makoto Ochi | 6-1, 6-1 | | match details | ||
| 06.05.17 | q 1 | Shuichi Sekiguchi | Yu-Seob Kim | 6-1, 6-4 | | match details | ||
| 15.04.17 | 1/2 | Bradley Mousley | Shuichi Sekiguchi | 7-68, 7-64 | | match details | China F5 | Hard |
| 14.04.17 | 1/4 | Shuichi Sekiguchi | Andriej Kapas | 5-7, 6-2, 4-2, Andriej Kapas - retired | | match details | ||
| 13.04.17 | 2nd round | Shuichi Sekiguchi | Tsung-Hua Yang | 6-2, 6-4 | | match details | ||
| 11.04.17 | 1st round | Shuichi Sekiguchi | Yu Chang | 6-1, 7-5 | | match details | ||
| 09.04.17 | fin | Zhe Li | Shuichi Sekiguchi | 6-3, 6-0 | | match details | China F4 | Hard |
| 08.04.17 | 1/2 | Shuichi Sekiguchi | Su Hao Zhong | 6-1, 2-6, 6-2 | | match details | ||
| 07.04.17 | 1/4 | Shuichi Sekiguchi | Jimmy Wang | 5-3, Jimmy Wang - retired | | match details | ||
| 06.04.17 | 2nd round | Shuichi Sekiguchi | Xi Qi | 6-4, 6-3 | | match details | ||
| 04.04.17 | 1st round | Shuichi Sekiguchi | Long Chen | 6-0, 6-0 | | match details | ||
| 23.03.17 | 2nd round | Uladzimir Ignatik | Shuichi Sekiguchi | 7-611, 6-4 | | match details | Quanzhou Challenger | Hard |
| 20.03.17 | 1st round | Shuichi Sekiguchi | Agustin Velotti | 7-65, 6-4 | | match details | ||
| 19.03.17 | qual. | Andrea Pellegrino | Shuichi Sekiguchi | 6-2, 7-66 | | match details | ||
| 18.03.17 | q 2 | Shuichi Sekiguchi | Alexander Bury | 6-2, 6-0 | | match details | ||
| 12.03.17 | q 1 | Shuichi Sekiguchi | Jaume Antoni Munar Clar | 6-4, 2-6, 6-3 | | match details | Shenzhen Challenger | Hard |
| 12.03.17 | q 2 | Kuan-Yi Lee | Shuichi Sekiguchi | 6-3, 6-4 | | match details | ||
| 06.03.17 | qual. | Lorenzo Sonego | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Zhuhai Challenger | Hard |
| 05.03.17 | q 2 | Shuichi Sekiguchi | Marc Polmans | 6-2, 6-4 | | match details | ||
| 04.03.17 | q 1 | Shuichi Sekiguchi | Ching-Mou Yu | 3-6, 6-4, 7-64 | | match details | ||
| 26.02.17 | qual. | Brydan Klein | Shuichi Sekiguchi | 7-5, 6-2 | | match details | Yokohama Challenger | Hard |
| 25.02.17 | q 2 | Shuichi Sekiguchi | Jimmy Wang | 2-6, 7-68, 6-2 | | match details | ||
| 24.02.17 | q 1 | Shuichi Sekiguchi | Yusuke Takahashi | 4-6, 6-3, 6-2 | | match details | ||
| 12.01.17 | 1/4 | Daniel Altmaier | Shuichi Sekiguchi | 6-4, 6-1 | | match details | Bangkok Challenger | Hard |
| 11.01.17 | 2nd round | Shuichi Sekiguchi | Yannick Mertens | 6-3, 3-6, 6-1 | | match details | ||
| 09.01.17 | 1st round | Shuichi Sekiguchi | Phassawit Burapharitta | 6-1, 6-4 | | match details | ||
| 03.01.17 | 1st round | Shuichi Sekiguchi | Li-Wie Tan | 6-4, 6-2 | | match details | Hong Kong | Hard |
| 03.01.17 | 2nd round | Anthony Jackie Tang | Shuichi Sekiguchi | 6-5, Shuichi Sekiguchi - retired | | match details | ||
| 31.12.16 | fin | Sora Fukuda | Shuichi Sekiguchi | 0-6, 7-64, 7-66 | | match details | Hong Kong | Hard |
| 30.12.16 | 1/2 | Shuichi Sekiguchi | Shintaro Imai | 7-63, 6-3 | | match details | ||
| 29.12.16 | 1/4 | Shuichi Sekiguchi | Geoffrey Blancaneaux | 6-0, 6-4 | | match details | ||
| 28.12.16 | 2nd round | Shuichi Sekiguchi | Hei Yin Andrew Li | 6-3, 6-0 | | match details | ||
| 27.12.16 | 1st round | Shuichi Sekiguchi | Yu Hsiou Hsu | 2-6, 6-4, 6-3 | | match details | ||
| 24.12.16 | 1/2 | Yuki Bhambri | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Hong Kong | Hard |
| 23.12.16 | 1/4 | Shuichi Sekiguchi | Kento Takeuchi | 5-7, 6-3, 6-2 | | match details | ||
| 22.12.16 | 2nd round | Shuichi Sekiguchi | Hong Kit Wong | 6-1, 6-0 | | match details | ||
| 18.12.16 | 1st round | Shuichi Sekiguchi | Alberto Lim | 6-4, 3-6, 6-3 | | match details | ||
| 02.11.16 | 2nd round | Marc Polmans | Shuichi Sekiguchi | 6-1, 6-2 | | match details | Canberra Challenger | Hard |
| 01.11.16 | 1st round | Shuichi Sekiguchi | Jarmere Jenkins | 2-6, 6-3, 6-0 | | match details | ||
| 20.10.16 | 2nd round | Go Soeda | Shuichi Sekiguchi | 6-3, 6-0 | | match details | Ningboo Challenger | Hard |
| 17.10.16 | 1st round | Shuichi Sekiguchi | Fajing Sun | 6-3, 7-5 | | match details | ||
| 16.10.16 | qual. | Shuichi Sekiguchi | Cheong-Eui Kim | 6-4, 4-6, 6-1 | | match details | ||
| 15.10.16 | q 2 | Shuichi Sekiguchi | Fabien Reboul | 7-5, 6-2 | | match details | ||
| 13.10.16 | 2nd round | Jordan Thompson | Shuichi Sekiguchi | 6-3, 6-3 | | match details | Ho Chi | Hard |
| 11.10.16 | 1st round | Shuichi Sekiguchi | Thien Nguyen Hoang | 6-1, 6-3 | | match details | ||
| 10.10.16 | qual. | Shuichi Sekiguchi | Yunseong Chung | 6-4, 4-6, 6-4 | | match details | ||
| 09.10.16 | q 2 | Shuichi Sekiguchi | Hoang Anh Khoa Tran | 6-2, 6-0 | | match details | ||
| 24.09.16 | q 1 | Hiroki Moriya | Shuichi Sekiguchi | 4-6, 6-3, 7-5 | | match details | Chengdu | Hard |
| 12.09.16 | 1st round | Tatsuma Ito | Shuichi Sekiguchi | 6-3, 1-6, 7-66 | | match details | Nanchang Challenger | Hard |
| 11.09.16 | qual. | Shuichi Sekiguchi | Jeevan Nedunchezhiyan | 6-4, 6-2 | | match details | ||
| 10.09.16 | q 2 | Shuichi Sekiguchi | Keisuke Numajiri | 6-0, 6-2 | | match details | ||
| 08.09.16 | 1st round | Blaz Kavcic | Shuichi Sekiguchi | 7-5, 6-3 | | match details | Shanghai Challenger | Hard |
| 05.09.16 | qual. | Shuichi Sekiguchi | Edan Leshem | 6-4, 6-4 | | match details | ||
| 04.09.16 | q 2 | Shuichi Sekiguchi | Xi Qi | 6-4, 6-2 | | match details | ||
| 30.08.16 | 1st round | Zhe Li | Shuichi Sekiguchi | 7-65, 6-3 | | match details | Bangkok Challenger | Hard |
| 02.08.16 | 1st round | Fajing Sun | Shuichi Sekiguchi | 2-6, 7-5, 6-3 | | match details | Chengdu Challenger | Hard |
| 25.07.16 | 1st round | Miki Jankovic | Shuichi Sekiguchi | 6-1, 6-2 | | match details | Astana Challenger | Hard |
| 20.07.16 | 2nd round | Zhe Li | Shuichi Sekiguchi | 6-3, 6-1 | | match details | Gimcheon Challenger | Hard |
| 18.07.16 | 1st round | Shuichi Sekiguchi | Sidharth Rawat | 6-71, 6-4, 6-2 | | match details | ||
| 13.07.16 | 2nd round | Min-Hyoek Cho | Shuichi Sekiguchi | 6-4, 6-1 | | match details | Korea F5 | Hard |
| 12.07.16 | 1st round | Shuichi Sekiguchi | Ivan Goluza | 6-2, 6-2 | | match details | ||
| 17.06.16 | 1/4 | Radu Albot | Shuichi Sekiguchi | 7-65, 6-3 | | match details | Fergana Challenger | Hard |
| 15.06.16 | 2nd round | Shuichi Sekiguchi | Dzmitry Zhyrmont | 6-3, 4-6, 6-3 | | match details | ||
| 13.06.16 | 1st round | Shuichi Sekiguchi | Denys Molchanov | 7-64, 6-5, Denys Molchanov - retired | | match details | ||
| 29.05.16 | fin | Andrew Whittington | Shuichi Sekiguchi | 7-66, 7-62 | | match details |  Guam F1 | Hard |
| 28.05.16 | 1/2 | Shuichi Sekiguchi | Masato Shiga | 6-4, 7-64 | | match details | ||
| 27.05.16 | 1/4 | Shuichi Sekiguchi | Gengo Kikuchi | 7-610, 7-65 | | match details | ||
| 26.05.16 | 2nd round | Shuichi Sekiguchi | Tadayuki Longhi | 6-0, 6-2 | | match details | ||
| 24.05.16 | 1st round | Shuichi Sekiguchi | Matthew Brooklyn | 6-4, 6-1 | | match details | ||
| 20.05.16 | 1/4 | Soon-Woo Kwon | Shuichi Sekiguchi | 6-1, 6-70, 6-3 | | match details | China F7 | Hard |
| 19.05.16 | 2nd round | Shuichi Sekiguchi | Evan Song | 6-74, 6-4, 6-1 | | match details | ||
| 17.05.16 | 1st round | Shuichi Sekiguchi | Harry Bourchier | 6-3, 2-6, 6-4 | | match details | ||
| 11.05.16 | 1st round | John Millman | Shuichi Sekiguchi | 7-5, 6-4 | | match details | Seoul Challenger | Hard |
| 09.05.16 | qual. | Alexander Ward | Shuichi Sekiguchi | 6-4, 6-3 | | match details | ||
| 08.05.16 | q 2 | Shuichi Sekiguchi | Jung-Woong Na | 6-4, 6-2 | | match details | ||
| 07.05.16 | q 1 | Shuichi Sekiguchi | Kento Takeuchi | 6-3, 6-0 | | match details | ||
| 16.04.16 | fin | Nicolas Barrientos | Shuichi Sekiguchi | 6-4, 6-1 | | match details | China F5 | Hard |
| 16.04.16 | 1/2 | Shuichi Sekiguchi | Chuhan Wang | 6-1, 7-5 | | match details | ||
| 15.04.16 | 1/4 | Shuichi Sekiguchi | Bowen Ouyang | 6-4, 6-4 | | match details | ||
| 14.04.16 | 2nd round | Shuichi Sekiguchi | Issei Okamura | 6-2, 6-2 | | match details | ||
| 12.04.16 | 1st round | Shuichi Sekiguchi | Wei-De Lin | 6-1, 6-0 | | match details | ||
| 09.04.16 | 1/4 | N.Sriram Balaji | Shuichi Sekiguchi | 3-6, 6-3, 7-5 | | match details | China F4 | Hard |
| 08.04.16 | 2nd round | Shuichi Sekiguchi | Zihao Xia | 6-1, 6-1 | | match details | ||
| 05.04.16 | 1st round | Shuichi Sekiguchi | Fajing Sun | 6-4, 6-0 | | match details | ||
| 25.03.16 | 1/2 | Duckhee Lee | Shuichi Sekiguchi | 7-5, 6-3 | | match details | Japan F3 | Hard |
| 24.03.16 | 1/4 | Shuichi Sekiguchi | Young Seok Kim | 6-2, 6-0 | | match details | ||
| 22.03.16 | 1st round | Shuichi Sekiguchi | Ryota Tanuma | 4-6, 6-1, 6-2 | | match details | ||
| 22.03.16 | 2nd round | Shuichi Sekiguchi | Yuya Ito | 7-5, 6-4 | | match details | ||
| 17.03.16 | 1/4 | Masaya Kobayashi | Shuichi Sekiguchi | 6-3, 6-2 | | match details | Japan F2 | Hard |
| 17.03.16 | 2nd round | Shuichi Sekiguchi | Sho Shimabukuro | 6-4, 6-2 | | match details | ||
| 15.03.16 | 1st round | Shuichi Sekiguchi | Yuto Sakai | 6-3, 6-1 | | match details | ||
| 12.03.16 | 1/2 | Gengo Kikuchi | Shuichi Sekiguchi | 7-65, 6-1 | | match details | Japan F1 | Hard |
| 11.03.16 | 1/4 | Shuichi Sekiguchi | Yuuya Kibi | 6-4, 6-3 | | match details | ||
| 10.03.16 | 2nd round | Shuichi Sekiguchi | Sho Katayama | 7-5, 7-64 | | match details | ||
| 09.03.16 | 1st round | Shuichi Sekiguchi | Masaki Sasai | 6-3, 6-0 | | match details | ||
| 02.02.16 | 1st round | Alex Bolt | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Launceston Challenger | Hard |
| 10.01.16 | q 2 | Frederik Nielsen | Shuichi Sekiguchi | 2-6, 6-3, 6-4 | | match details | Bangkok Challenger | Hard |
| 09.01.16 | q 1 | Shuichi Sekiguchi | Grzegorz Panfil | 4-6, 6-3, 6-3 | | match details | ||
| 02.01.16 | q 1 | Jason Jung | Shuichi Sekiguchi | 7-66, 6-1 | | match details | Bangkok Challenger | Hard |
| 15.11.15 | q 2 | Shuichi Sekiguchi | Keisuke Watanuki | 7-5, 7-5 | | match details | Yokohama Challenger | Hard |
| 15.11.15 | qual. | Yuuya Kibi | Shuichi Sekiguchi | 6-2, 3-6, 6-3 | | match details | ||
| 14.11.15 | q 1 | Shuichi Sekiguchi | Toshihide Matsui | 6-3, 6-2 | | match details | ||
| 10.10.15 | q 1 | Nikoloz Basilashvili | Shuichi Sekiguchi | 6-4, 6-2 | | match details | Shanghai | Hard |
| 03.10.15 | q 1 | Austin Krajicek | Shuichi Sekiguchi | 6-2, 6-4 | | match details | Tokyo | Hard |
| 20.09.15 | qual. | Chu-Huan Yi | Shuichi Sekiguchi | 6-4, 6-4 | | match details | Kaohsiung Challenger | Hard |
| 20.09.15 | q 2 | Shuichi Sekiguchi | Cing-Yang Meng | 6-4, 6-2 | | match details | ||
| 13.09.15 | q 2 | Finn Tearney | Shuichi Sekiguchi | 7-5, 6-2 | | match details | Nanchang Challenger | Hard |
| 06.09.15 | q 2 | Andrew Whittington | Shuichi Sekiguchi | 7-65, 6-2 | | match details | Shanghai Challenger | Hard |
| 05.09.15 | q 1 | Shuichi Sekiguchi | Long Chen | 6-4, 6-2 | | match details | ||
| 03.09.15 | 2nd round | Alexander Sarkissian | Shuichi Sekiguchi | 7-5, 6-4 | | match details | Bangkok Challenger | Hard |
| 02.09.15 | 1st round | Shuichi Sekiguchi | Takuto Niki | 6-2, 7-5 | | match details | ||
| 27.07.15 | qual. | Somdev Devvarman | Shuichi Sekiguchi | 6-3, 6-3 | | match details | Atlanta | Hard |
| 26.07.15 | q 2 | Shuichi Sekiguchi | Matthew Ebden | 7-5, 5-2, Matthew Ebden - retired | | match details | ||
| 25.07.15 | q 1 | Shuichi Sekiguchi | Reilly Opelka | 6-4, 6-4 | | match details | ||
| 23.07.15 | 2nd round | Matteo Donati | Shuichi Sekiguchi | 6-4, 6-1 | | match details |  Granby Challenger | Hard |
| 22.07.15 | 1st round | Shuichi Sekiguchi | Frank Dancevic | 3-6, 6-3, 6-4 | | match details | ||
| 22.06.15 | 1/4 | Shuichi Sekiguchi | Karunuday Singh | 6-0, 6-2 | | match details | Thailand F5 | Hard |
| 22.06.15 | fin | Christopher Rungkat | Shuichi Sekiguchi | 6-4, 6-3 | | match details | ||
| 22.06.15 | 1/2 | Shuichi Sekiguchi | Jung-Woong Na | 6-4, 6-3 | | match details | ||
| 22.06.15 | 1st round | Shuichi Sekiguchi | Woo-Ram Kim | 6-2, 3-6, 6-1 | | match details | ||
| 22.06.15 | 2nd round | Shuichi Sekiguchi | Warit Sornbutnark | 6-4, 6-3 | | match details | ||
| 15.06.15 | 1st round | Shuichi Sekiguchi | Punnakrit Kritakara | 6-2, 6-1 | | match details | Thailand F4 | Hard |
| 15.06.15 | fin | Shuichi Sekiguchi | Kento Takeuchi | 6-1, 6-2 | | match details | ||
| 15.06.15 | 2nd round | Shuichi Sekiguchi | Ken Onishi | 6-3, 6-3 | | match details | ||
| 15.06.15 | 1/4 | Shuichi Sekiguchi | Christopher Rungkat | 6-73, 7-5, 3-0, Christopher Rungkat - retired | | match details | ||
| 15.06.15 | 1/2 | Shuichi Sekiguchi | Toshihide Matsui | 6-4, 6-4 | | match details | ||
| 08.06.15 | 1st round | Masaki Sasai | Shuichi Sekiguchi | 7-66, 7-5 | | match details | Japan F6 | Hard |
| 04.06.15 | 2nd round | Hiroyasu Ehara | Shuichi Sekiguchi | 6-4, 6-1 | | match details | Gimcheon Challenger | Hard |
| 02.06.15 | 1st round | Shuichi Sekiguchi | Marko Tepavac | 6-1, 6-3 | | match details | ||
| 13.04.15 | 1st round | Finn Tearney | Shuichi Sekiguchi | 7-62, 3-6, 7-62 | | match details | Indonesia F3 | Hard |
| 06.04.15 | 1/4 | Shuichi Sekiguchi | Jeson Patrombon | 6-2, 6-0 | | match details | Indonesia F2 | Hard |
| 06.04.15 | fin | Duckhee Lee | Shuichi Sekiguchi | 6-1, 3-0, Shuichi Sekiguchi - retired | | match details | ||
| 06.04.15 | 1/2 | Shuichi Sekiguchi | Finn Tearney | 6-0, 6-1 | | match details | ||
| 06.04.15 | 1st round | Shuichi Sekiguchi | Aaron Cortes Alcaraz | 6-2, 6-2 | | match details | ||
| 06.04.15 | 2nd round | Shuichi Sekiguchi | Ronit Singh Bisht | 6-4, 6-75, 4-3, Ronit Singh Bisht - retired | | match details | ||
| 30.03.15 | 2nd round | Shuichi Sekiguchi | Ryotaro Matsumura | 6-2, 6-4 | | match details | Japan F4 | Hard |
| 30.03.15 | 1/4 | Zhe Li | Shuichi Sekiguchi | 6-4, 2-6, 6-2 | | match details | ||
| 30.03.15 | 1st round | Shuichi Sekiguchi | Arata Onozawa | 6-4, 6-4 | | match details | ||
| 23.03.15 | 1st round | Shuichi Sekiguchi | Yusuke Watanuki | 6-1, 6-3 | | match details | Japan F3 | Hard |
| 23.03.15 | 1/4 | Di Wu | Shuichi Sekiguchi | 1-6, 7-5, 6-2 | | match details | ||
| 23.03.15 | 2nd round | Shuichi Sekiguchi | Takashi Saito | 6-3, 7-64 | | match details | ||
| 16.03.15 | qual. | Yasutaka Uchiyama | Shuichi Sekiguchi | 6-2, 6-2 | | match details | Shenzhen Challenger | Hard |
| 15.03.15 | q 2 | Shuichi Sekiguchi | Bowen Ouyang | 6-4, 6-0 | | match details | ||
| 14.03.15 | q 1 | Shuichi Sekiguchi | Miliaan Niesten | 7-5, 7-64 | | match details | ||
| 12.01.15 | 1st round | Shuichi Sekiguchi | Yi Fan Wu | 6-4, 6-2 | | match details |  Turkey F2 | Hard |
| 12.01.15 | 2nd round | Jose Pereira | Shuichi Sekiguchi | 6-3, 7-5 | | match details | ||
| 05.01.15 | 2nd round | Shuichi Sekiguchi | Vladimir Uzhylovsky | 6-3, 7-5 | | match details | Turkey F1 | Hard |
| 05.01.15 | 1/4 | Shuichi Sekiguchi | Jose Pereira | 6-4, 3-6, 6-3 | | match details | ||
| 05.01.15 | 1/2 | Shuichi Sekiguchi | Alexey Vatutin | 6-4, 2-6, 7-5 | | match details | ||
| 05.01.15 | 1st round | Shuichi Sekiguchi | Vasil Shandarov | 6-1, 6-3 | | match details | ||
| 05.01.15 | fin | Shuichi Sekiguchi | Hugo Nys | 6-79, 6-4, 6-3 | | match details | ||
| 01.12.14 | 1st round | Shuichi Sekiguchi | Congsup Congcar | 6-0, 6-3 | | match details | Thailand F11 | Hard |
| 01.12.14 | 2nd round | Phassawit Burapharitta | Shuichi Sekiguchi | 6-3, 6-4 | | match details | ||
| 24.11.14 | 1st round | Shuichi Sekiguchi | Pol Wattanakul | 7-65, 2-0, Pol Wattanakul - retired | | match details | Thailand F10 | Hard |
| 24.11.14 | 2nd round | Yasutaka Uchiyama | Shuichi Sekiguchi | 4-6, 7-5, 6-2 | | match details | ||
| 10.11.14 | 1st round | Hyeon Chung | Shuichi Sekiguchi | 6-0, 6-0 | | match details | Yokohama Challenger | Hard |
| 09.11.14 | qual. | Shuichi Sekiguchi | Yuichi Ito | 6-2, 6-2 | | match details | ||
| 08.11.14 | q 2 | Shuichi Sekiguchi | Katsuki Nagao | 7-65, 7-65 | | match details | ||
| 27.09.14 | q 1 | Pierre-Hugues Herbert | Shuichi Sekiguchi | 7-65, 6-3 | | match details | Tokyo | Hard |
| 15.07.14 | 1st round | Liang-Chi Huang | Shuichi Sekiguchi | 6-0, 6-1 | | match details | Kaohsiung Challenger | Hard |
| 14.07.14 | qual. | Shuichi Sekiguchi | Bumpei Sato | 1-6, 6-4, 6-2 | | match details | ||
| 13.07.14 | q 2 | Shuichi Sekiguchi | Keng-Cheng Lin | 6-3, 7-5 | | match details | ||
| 24.06.14 | 1st round | Denis Matsukevitch | Shuichi Sekiguchi | 6-3, 6-0 | | match details | Nanchang Challenger | Hard |
| 19.06.14 | 2nd round | Danai Udomchoke | Shuichi Sekiguchi | 6-2, 6-3 | | match details | Tianjin Challenger | Hard |
| 17.06.14 | 1st round | Shuichi Sekiguchi | Nicolas Meister | 6-3, 6-1 | | match details | ||
| 13.06.14 | 1/4 | Denys Molchanov | Shuichi Sekiguchi | 7-63, 6-2 | | match details | Fergana Challenger | Hard |
| 12.06.14 | 2nd round | Shuichi Sekiguchi | Sanjar Fayziev | 6-3, 6-2 | | match details | ||
| 10.06.14 | 1st round | Shuichi Sekiguchi | Odil Akramov | 6-1, 6-1 | | match details | ||
| 19.05.14 | 1st round | Nikoloz Basilashvili | Shuichi Sekiguchi | 6-1, 6-4 | | match details | Karshi Challenger | Hard |
| 14.05.14 | 2nd round | Go Soeda | Shuichi Sekiguchi | 6-1, 6-4 | | match details | Busan Challenger | Hard |
| 12.05.14 | 1st round | Shuichi Sekiguchi | Tsung-Hua Yang | 6-1, 6-4 | | match details | ||
| 22.04.14 | 1st round | Yasutaka Uchiyama | Shuichi Sekiguchi | 7-5, 7-64 | | match details | Shenzhen Challenger | Hard |
| 21.04.14 | qual. | Shuichi Sekiguchi | Victor Baluda | 6-3, 6-0 | | match details | ||
| 20.04.14 | q 2 | Shuichi Sekiguchi | Siyu Liu | 2-6, 6-4, 6-1 | | match details | ||
| 19.04.14 | q 1 | Shuichi Sekiguchi | Arata Onozawa | 6-3, 7-65 | | match details | ||
| 14.04.14 | 2nd round | Chuhan Wang | Shuichi Sekiguchi | 6-4, 7-65 | | match details | China F5 | Hard |
| 14.04.14 | 1st round | Shuichi Sekiguchi | Yuichi Ito | 6-3, 6-4 | | match details | ||
| 31.03.14 | 2nd round | Shuichi Sekiguchi | Sonchat Ratiwatana | 6-4, 6-3 | | match details |  Malaysia F1 | Hard |
| 31.03.14 | 1st round | Shuichi Sekiguchi | Vaja Uzakov | 6-2, 6-2 | | match details | ||
| 31.03.14 | 1/4 | Carlos Boluda-Purkiss | Shuichi Sekiguchi | 7-5, 7-5 | | match details | ||
| 24.03.14 | 1/4 | Shuichi Sekiguchi | Andrew Whittington | 7-5, 6-3 | | match details |  Philippines F1 | Hard |
| 24.03.14 | 1/2 | Shuichi Sekiguchi | Benjamin Mitchell | 4-6, 6-1, 6-2 | | match details | ||
| 24.03.14 | fin | Karunuday Singh | Shuichi Sekiguchi | 6-4, 5-7, 6-3 | | match details | ||
| 24.03.14 | 1st round | Shuichi Sekiguchi | Christopher Rungkat | 6-4, 6-4 | | match details | ||
| 24.03.14 | 2nd round | Shuichi Sekiguchi | Kittiphong Wachiramanowong | 6-3, 6-2 | | match details | ||
| 17.03.14 | fin | Danai Udomchoke | Shuichi Sekiguchi | 6-4, 6-2 | | match details | Japan F2 | Hard |
| 17.03.14 | 1/2 | Shuichi Sekiguchi | Yuuya Kibi | 6-4, 6-0 | | match details | ||
| 17.03.14 | 1st round | Shuichi Sekiguchi | Jui-Chen Hung | 6-3, 4-6, 6-4 | | match details | ||
| 17.03.14 | 2nd round | Shuichi Sekiguchi | Masato Shiga | 6-3, 6-2 | | match details | ||
| 17.03.14 | 1/4 | Shuichi Sekiguchi | Kento Takeuchi | 6-1, 6-3 | | match details | ||
| 10.03.14 | 1st round | Kento Takeuchi | Shuichi Sekiguchi | 6-3, 2-1, Shuichi Sekiguchi - retired | | match details | Japan F1 | Hard |
| 03.02.14 | 1st round | Luke Saville | Shuichi Sekiguchi | 6-3, 6-4 | | match details | West Lakes | Hard |
| 28.01.14 | 1st round | Matthew Barton | Shuichi Sekiguchi | 6-2, 6-2 | | match details | Burnie Challenger | Hard |
| 25.11.13 | 1st round | Shuichi Sekiguchi | Dineshkanthan Thangarajah | 6-1, 6-1 | | match details |  Cambodia F1 | Hard |
| 25.11.13 | 2nd round | Gavin Van Peperzeel | Shuichi Sekiguchi | 6-3, 6-4 | | match details | ||
| 11.11.13 | 1st round | Enrique Lopez-Perez | Shuichi Sekiguchi | 4-6, 6-4, 6-2 | | match details | Yokohama Challenger | Hard |
| 10.11.13 | q 2 | Shuichi Sekiguchi | Yuichi Ito | 6-3, 6-3 | | match details | ||
| 10.11.13 | qual. | Shuichi Sekiguchi | Mitchell Krueger | 6-1, 6-4 | | match details | ||
| 09.11.13 | q 1 | Shuichi Sekiguchi | Toshihide Matsui | 6-1, 6-0 | | match details | ||
| 29.10.13 | 1st round | Blaz Kavcic | Shuichi Sekiguchi | 6-4, 3-0, Shuichi Sekiguchi - retired | | match details | Seoul Challenger | Hard |
| 24.10.13 | 2nd round | Michael Venus | Shuichi Sekiguchi | 6-3, 6-2 | | match details | Melbourne Challenger | Hard |
| 23.10.13 | 1st round | Shuichi Sekiguchi | Yuichi Sugita | 6-2, 6-4 | | match details | ||
| 05.10.13 | q 1 | Yen-Hsun Lu | Shuichi Sekiguchi | 6-0, 6-1 | | match details | Shanghai | Hard |
| 28.09.13 | q 1 | Michal Przysiezny | Shuichi Sekiguchi | 6-3, 6-2 | | match details | Tokyo | Hard |
| 19.09.13 | 2nd round | Alejandro Gonzalez | Shuichi Sekiguchi | 7-65, 6-4 | | match details | Kaoshuing Challenger | Hard |
| 16.09.13 | 1st round | Shuichi Sekiguchi | Hsin-Han Lee | 7-66, 6-4 | | match details | ||
| 03.09.13 | 1st round | Malek Jaziri | Shuichi Sekiguchi | 6-4, 7-5 | | match details | Shanghai Challenger | Hard |
| 27.08.13 | 1st round | Benjamin Mitchell | Shuichi Sekiguchi | 6-4, 6-0 | | match details | Bangkok Challenger | Hard |
| 19.08.13 | 2nd round | Woo-Ram Kim | Shuichi Sekiguchi | 6-2, Shuichi Sekiguchi - retired | | match details | Chinese Taipei | Hard |
| 19.08.13 | 1st round | Shuichi Sekiguchi | Chi-Shan Jao | 6-4, 6-4 | | match details | ||
| 12.08.13 | 2nd round | Shuichi Sekiguchi | Arata Onozawa | 1-0, Arata Onozawa - retired | | match details | China F7 | Hard |
| 12.08.13 | 1/4 | Shuichi Sekiguchi | Duckhee Lee | 6-3, 6-0 | | match details | ||
| 12.08.13 | fin | Liang-Chi Huang | Shuichi Sekiguchi | 6-1, 7-5 | | match details | ||
| 12.08.13 | 1/2 | Shuichi Sekiguchi | Ji Sung Nam | 5-7, 6-1, 6-4 | | match details | ||
| 12.08.13 | 1st round | Shuichi Sekiguchi | Chuhan Wang | 6-4, 7-5 | | match details | ||
| 05.08.13 | 2nd round | Shuichi Sekiguchi | Yuanfeng Li | 6-1, 6-2 | | match details | China F6 | Hard |
| 05.08.13 | 1/2 | Yong-Kyu Lim | Shuichi Sekiguchi | 6-1, 6-2 | | match details | ||
| 05.08.13 | 1/4 | Shuichi Sekiguchi | Jui-Chen Hung | 6-2, 6-3 | | match details | ||
| 05.08.13 | 1st round | Shuichi Sekiguchi | Wishaya Trongcharoenchaikul | 6-74, 6-2, 6-3 | | match details | ||
| 11.07.13 | 2nd round | Hiroki Moriya | Shuichi Sekiguchi | 6-4, 6-73, 6-3 | | match details | Beijing Challenger | Hard |
| 11.07.13 | 1st round | Shuichi Sekiguchi | Bowen Ouyang | 4-6, 6-3, 6-4 | | match details | ||
| 03.06.13 | 1st round | Shuichi Sekiguchi | Hwi Kim | 6-3, 6-0 | | match details | Korea F5 | Hard |
| 03.06.13 | 2nd round | Shuichi Sekiguchi | Seung-Jae Lee | 7-64, 6-2 | | match details | ||
| 03.06.13 | 1/4 | Benjamin Mitchell | Shuichi Sekiguchi | 6-0, 4-6, 6-3 | | match details | ||
| 27.05.13 | 2nd round | Shuichi Sekiguchi | Woong-Sun Jun | 6-3, 0-6, 7-5 | | match details | Korea F4 | Hard |
| 27.05.13 | 1/4 | Shuichi Sekiguchi | Laurynas Grigelis | 6-3, 6-3 | | match details | ||
| 27.05.13 | fin | Yong-Kyu Lim | Shuichi Sekiguchi | 7-5, 6-3 | | match details | ||
| 27.05.13 | 1/2 | Shuichi Sekiguchi | Ji Sung Nam | 6-3, 6-3 | | match details | ||
| 27.05.13 | 1st round | Shuichi Sekiguchi | Woo-Ram Kim | 7-64, 2-6, 6-4 | | match details | ||
| 06.05.13 | 1/4 | Shuichi Sekiguchi | Kevin Griekspoor | 6-74, 6-1, 6-1 | | match details |  Israel F9 | Hard |
| 06.05.13 | fin | James Marsalek | Shuichi Sekiguchi | 6-4, 7-5 | | match details | ||
| 06.05.13 | 1/2 | Shuichi Sekiguchi | Or Ram-Harel | 6-3, 4-6, 6-2 | | match details | ||
| 06.05.13 | 1st round | Shuichi Sekiguchi | Daniel Skripnik | 6-3, 6-2 | | match details | ||
| 06.05.13 | 2nd round | Shuichi Sekiguchi | Bar Tzuf Botzer | 7-69, 6-2 | | match details | ||
| 29.04.13 | fin | Shuichi Sekiguchi | Gavin Van Peperzeel | 6-4, 6-1 | | match details | Israel F8 | Hard |
| 29.04.13 | 2nd round | Shuichi Sekiguchi | Kevin Griekspoor | 6-3, 6-1 | | match details | ||
| 29.04.13 | 1/4 | Shuichi Sekiguchi | Yannick Vandenbulcke | 7-69, 7-65 | | match details | ||
| 29.04.13 | 1/2 | Shuichi Sekiguchi | Sam Barry | 6-2, 6-4 | | match details | ||
| 29.04.13 | 1st round | Shuichi Sekiguchi | Arata Onozawa | 6-3, 7-5 | | match details | ||
| 22.04.13 | 1st round | Shuichi Sekiguchi | Daniel Glancy | 6-3, 6-1 | | match details | Israel F7 | Hard |
| 22.04.13 | 2nd round | Shuichi Sekiguchi | Daniel Skripnik | 7-5, 5-7, 6-2 | | match details | ||
| 22.04.13 | 1/4 | Shuichi Sekiguchi | Bar Tzuf Botzer | 6-2, 6-3 | | match details | ||
| 22.04.13 | 1/2 | Enzo Couacaud | Shuichi Sekiguchi | 5-7, 7-5, 6-1 | | match details | ||
| 25.03.13 | 1st round | Shuichi Sekiguchi | Min-Kyu Song | 6-3, 6-2 | | match details | Japan F3 | Hard |
| 25.03.13 | 1/4 | Yu Chang | Shuichi Sekiguchi | 6-3, 6-4 | | match details | ||
| 25.03.13 | 2nd round | Shuichi Sekiguchi | Sho Katayama | 6-2, 6-2 | | match details | ||
| 18.03.13 | 1st round | Shuichi Sekiguchi | Masaki Sasai | 6-3, 6-2 | | match details | Japan F2 | Hard |
| 18.03.13 | 2nd round | Gengo Kikuchi | Shuichi Sekiguchi | 7-5, 7-65 | | match details | ||
| 11.03.13 | 1st round | Shuichi Sekiguchi | Shota Tagawa | 6-1, 6-1 | | match details | Japan F1 | Hard |
| 11.03.13 | 2nd round | Shuichi Sekiguchi | Kaichi Uchida | 6-1, 7-64 | | match details | ||
| 11.03.13 | 1/4 | Yasutaka Uchiyama | Shuichi Sekiguchi | 7-60, 6-73, 6-1 | | match details | ||
| 14.01.13 | 1st round | Shuichi Sekiguchi | Durukan Durmus | 6-3, 6-0 | | match details | Turkey F2 | Hard |
| 14.01.13 | 2nd round | Damir Dzumhur | Shuichi Sekiguchi | 6-1, 6-4 | | match details | ||
| 07.01.13 | 1st round | Liang-Chi Huang | Shuichi Sekiguchi | 6-4, 6-2 | | match details | Turkey F1 | Hard |
| 14.11.12 | 2nd round | Mirza Basic | Shuichi Sekiguchi | 7-62, 6-2 | | match details | Yokohama Challenger | Hard |
| 12.11.12 | 1st round | Shuichi Sekiguchi | Ti Chen | 6-4, 4-6, 6-4 | | match details | ||
| 12.11.12 | q 1 | Shuichi Sekiguchi | Bumpei Sato | 6-4, 6-2 | | match details | ||
| 12.11.12 | q 2 | Shuichi Sekiguchi | Manato Tanimoto | 6-1, 6-2 | | match details | ||
| 12.11.12 | qual. | Shuichi Sekiguchi | Kittiphong Wachiramanowong | 6-74, 6-1, 6-1 | | match details | ||
| 29.10.12 | 1st round | Luke Saville | Shuichi Sekiguchi | 6-2, 6-2 | | match details | Australia F12 | Hard |
| 22.10.12 | 1st round | Dayne Kelly | Shuichi Sekiguchi | 6-2, 6-4 | | match details | Australia F11 | Hard |
| 15.10.12 | 1/2 | Hiroki Kondo | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Japan F9 | Hard |
| 15.10.12 | 2nd round | Shuichi Sekiguchi | Masatoshi Miyazaki | 5-7, 7-65, 6-2 | | match details | ||
| 15.10.12 | 1/4 | Shuichi Sekiguchi | Hiroyasu Ehara | 6-0, 6-4 | | match details | ||
| 15.10.12 | 1st round | Shuichi Sekiguchi | Yuuya Kibi | 6-0, 6-2 | | match details | ||
| 29.09.12 | q 1 | Dusan Lajovic | Shuichi Sekiguchi | 6-1, 7-5 | | match details | Tokyo | Hard |
| 24.09.12 | 1st round | Shuichi Sekiguchi | Chieh-Fu Wang | 7-62, 1-6, 6-3 | | match details | Vietnam F6 | Hard |
| 24.09.12 | 2nd round | Shuichi Sekiguchi | Hyun-Woo Nam | 6-2, 3-6, 3-0, Hyun-Woo Nam - retired | | match details | ||
| 24.09.12 | 1/4 | Shuichi Sekiguchi | Vijayant Malik | 6-4, 6-1 | | match details | ||
| 24.09.12 | 1/2 | Liang-Chi Huang | Shuichi Sekiguchi | 6-4, 6-2 | | match details | ||
| 17.09.12 | 1st round | Jae Hwan Kim | Shuichi Sekiguchi | 6-1, 6-2 | | match details | Vietnam F5 | Hard |
| 10.09.12 | q 2 | Ruikai Wang | Shuichi Sekiguchi | 7-64, 6-4 | | match details | Ningboo Challenger | Hard |
| 03.09.12 | qual. | Antony Dupuis | Shuichi Sekiguchi | 7-5, 6-2 | | match details | Shanghai Challenger | Hard |
| 02.09.12 | q 2 | Shuichi Sekiguchi | Chu-Huan Yi | 7-65, 6-3 | | match details | ||
| 01.09.12 | q 1 | Shuichi Sekiguchi | Zhaoyi Cao | 6-4, 6-4 | | match details | ||
| 04.08.12 | q 1 | Hiroyasu Ehara | Shuichi Sekiguchi | 4-0, Shuichi Sekiguchi - retired | | match details | Aptos Challenger | Hard |
| 28.07.12 | q 2 | Jeff Dadamo | Shuichi Sekiguchi | 7-63, 6-4 | | match details | Vancouver Challenger | Hard |
| 21.07.12 | q 1 | Jarmere Jenkins | Shuichi Sekiguchi | 6-0, 6-3 | | match details | Lexington Challenger | Hard |
| 14.05.12 | 2nd round | Shuichi Sekiguchi | Tyler Hochwalt | 3-6, 7-5, 4-0, Tyler Hochwalt - retired | | match details | Thailand F2 | Hard |
| 14.05.12 | 1/4 | Christopher Rungkat | Shuichi Sekiguchi | 4-3, Shuichi Sekiguchi - retired | | match details | ||
| 14.05.12 | 1st round | Shuichi Sekiguchi | Gavin Van Peperzeel | 6-1, 5-7, 7-5 | | match details | ||
| 07.05.12 | 2nd round | Shuichi Sekiguchi | Warit Sornbutnark | 6-4, 6-4 | | match details | Thailand F1 | Hard |
| 07.05.12 | 1/4 | Shuichi Sekiguchi | Nick Lindahl | 4-6, 6-3, 6-4 | | match details | ||
| 07.05.12 | 1st round | Shuichi Sekiguchi | Punnakrit Kritakara | 7-5, 6-2 | | match details | ||
| 07.05.12 | 1/2 | Luke Saville | Shuichi Sekiguchi | 6-0, 7-66 | | match details | ||
| 02.04.12 | 1st round | Bowen Ouyang | Shuichi Sekiguchi | 6-4, 4-6, 6-4 | | match details | Japan F4 | Hard |
| 26.03.12 | 1st round | Shuichi Sekiguchi | Hiroyasu Ehara | 6-2, 4-6, 7-5 | | match details | Japan F3 | Hard |
| 26.03.12 | 1/4 | Hiroki Moriya | Shuichi Sekiguchi | 7-63, 6-1 | | match details | ||
| 26.03.12 | 2nd round | Shuichi Sekiguchi | Ya-Nan Ma | 6-4, 6-4 | | match details | ||
| 19.03.12 | 1st round | Shuichi Sekiguchi | Bumpei Sato | 6-1, 6-0 | | match details | Japan F2 | Hard |
| 19.03.12 | 2nd round | Hiroki Kondo | Shuichi Sekiguchi | 6-4, 7-66 | | match details | ||
| 12.03.12 | 1st round | Shota Tagawa | Shuichi Sekiguchi | 7-63, 4-6, 7-62 | | match details | Japan F1 | Hard |
| 05.03.12 | 1st round | Shuichi Sekiguchi | Rohan Gajjar | 2-6, 6-3, 7-62 | | match details | India F3 | Hard |
| 05.03.12 | 1/4 | Sanam Singh | Shuichi Sekiguchi | 6-3, 6-1 | | match details | ||
| 05.03.12 | 2nd round | Shuichi Sekiguchi | James Feaver | 6-3, 6-3 | | match details | ||
| 27.02.12 | fin | Sanam Singh | Shuichi Sekiguchi | 6-1, 6-4 | | match details | India F2 | Hard |
| 27.02.12 | 1st round | Shuichi Sekiguchi | Ranjeet Virali-Murugesan | 7-5, 1-6, 3-0, Ranjeet Virali-Murugesan - retired | | match details | ||
| 27.02.12 | 2nd round | Shuichi Sekiguchi | James Feaver | 6-2, 3-0, James Feaver - retired | | match details | ||
| 27.02.12 | 1/4 | Shuichi Sekiguchi | Arata Onozawa | 6-4, 6-4 | | match details | ||
| 27.02.12 | 1/2 | Shuichi Sekiguchi | Jordi Munoz-Abreu | 7-5, 5-7, 7-5 | | match details | ||
| 20.02.12 | 1st round | Shuichi Sekiguchi | Ranjeet Singh | 6-1, 6-0 | | match details | India F1 | Hard |
| 20.02.12 | 1/4 | Sanam Singh | Shuichi Sekiguchi | 6-1, 6-1 | | match details | ||
| 20.02.12 | 2nd round | Shuichi Sekiguchi | Hsin-Han Lee | 4-6, 6-3, 7-63 | | match details | ||
| 03.10.11 | 1st round | Elbert Sie | Shuichi Sekiguchi | 7-65, 6-1 | | match details | Indonesia F5 | Hard |
| 26.09.11 | 1st round | N. Vijay Sundar Prashanth | Shuichi Sekiguchi | 4-6, 6-1, 6-1 | | match details | Indonesia F4 | Hard |
| 22.08.11 | 1st round | Shuichi Sekiguchi | Damien Lacombe | 6-0, 6-3 | | match details |  Italy F24 | Hard |
| 22.08.11 | 2nd round | Manuel Jorquera | Shuichi Sekiguchi | 6-2, 6-4 | | match details | ||
| 13.06.11 | 1/4 | Hiroki Moriya | Shuichi Sekiguchi | 7-5, 6-4 | | match details | Japan F6 | Hard |
| 13.06.11 | 1st round | Shuichi Sekiguchi | Yuichi Ito | 6-1, 6-1 | | match details | ||
| 13.06.11 | 2nd round | Shuichi Sekiguchi | Takeshi Endo | 6-3, 6-4 | | match details | ||
| 11.04.11 | 1st round | Thibault Venturino | Shuichi Sekiguchi | 6-2, 6-1 | | match details | Thailand F3 | Hard |
| 04.04.11 | 1st round | Shuichi Sekiguchi | Alec Witmeur | 6-3, 6-2 | | match details | Thailand F2 | Hard |
| 04.04.11 | 2nd round | Daniel Evans | Shuichi Sekiguchi | 6-3, 4-6, 6-3 | | match details | ||
| 31.01.11 | 1st round | Christopher Rungkat | Shuichi Sekiguchi | 2-6, 6-1, 6-3 | | match details | Cambodia F2 | Hard |
| 24.01.11 | 2nd round | Rohan Gajjar | Shuichi Sekiguchi | 6-3, 6-4 | | match details | Cambodia F1 | Hard |
| 24.01.11 | 1st round | Shuichi Sekiguchi | Peng Gao | 7-63, 6-2 | | match details | ||
| 18.10.10 | 1/4 | Shuichi Sekiguchi | Harri Heliovaara | 6-4, 3-6, 7-5 | | match details | Japan F10 | Hard |
| 18.10.10 | 1/2 | Shuichi Sekiguchi | Ti Chen | 6-4, 6-2 | | match details | ||
| 18.10.10 | 1st round | Shuichi Sekiguchi | Kento Takeuchi | 3-6, 6-4, 6-1 | | match details | ||
| 18.10.10 | fin | Danai Udomchoke | Shuichi Sekiguchi | 6-1, 6-76, 6-4 | | match details | ||
| 18.10.10 | 2nd round | Shuichi Sekiguchi | Kittiphong Wachiramanowong | 6-2, 6-4 | | match details | ||
| 11.10.10 | 1st round | Shuichi Sekiguchi | Kento Takeuchi | 6-0, 2-6, 6-4 | | match details | Japan F9 | Hard |
| 11.10.10 | 2nd round | Toshihide Matsui | Shuichi Sekiguchi | 6-1, 6-1 | | match details | ||
| 13.09.10 | q 1 | Soong-Jae Cho | Shuichi Sekiguchi | 6-1, 6-2 | | match details | Bangkok Challenger | Hard |
| 16.08.10 | 1st round | Shuichi Sekiguchi | Weerapat Doakmaiklee | 6-3, 6-4 | | match details | Thailand F3 | Hard |
| 16.08.10 | 1/4 | Suk-Young Jeong | Shuichi Sekiguchi | 6-2, 7-5 | | match details | ||
| 16.08.10 | 2nd round | Shuichi Sekiguchi | Danai Udomchoke | 6-2, 1-6, 7-64 | | match details | ||
| 09.08.10 | 1st round | Christopher Rungkat | Shuichi Sekiguchi | 6-2, 6-74, 6-2 | | match details | Thailand F2 | Hard |
| 31.05.10 | 1st round | Mao-Xin Gong | Shuichi Sekiguchi | 6-1, 1-6, 6-2 | | match details | China F5 | Hard |
| 05.04.10 | fin | Yasutaka Uchiyama | Shuichi Sekiguchi | 7-5, 6-1 | | match details | Japan F4 | Hard |
| 05.04.10 | 1/4 | Shuichi Sekiguchi | Tasuku Iwami | 7-5, 6-74, 7-64 | | match details | ||
| 05.04.10 | 1/2 | Shuichi Sekiguchi | Yuichi Ito | 6-2, 2-1, Yuichi Ito - retired | | match details | ||
| 05.04.10 | 1st round | Shuichi Sekiguchi | Akito Higa | 6-3, 6-1 | | match details | ||
| 05.04.10 | 2nd round | Shuichi Sekiguchi | Kirati Siributwong | 6-2, 6-1 | | match details | ||
| 29.03.10 | 1/4 | Shuichi Sekiguchi | Tatsuma Ito | 1-6, 7-61, 6-1 | | match details | Japan F3 | Hard |
| 29.03.10 | 1st round | Shuichi Sekiguchi | Perakiat Siriluethaiwattana | 6-1, 6-1 | | match details | ||
| 29.03.10 | 1/2 | Chu-Huan Yi | Shuichi Sekiguchi | 7-5, 3-6, 6-3 | | match details | ||
| 29.03.10 | 2nd round | Shuichi Sekiguchi | Weerapat Doakmaiklee | 7-65, 2-6, 6-2 | | match details | ||
| 22.03.10 | 1st round | Kento Takeuchi | Shuichi Sekiguchi | 6-71, 7-5, 6-3 | | match details | Japan F2 | Hard |
| 15.03.10 | 1/2 | Yuichi Ito | Shuichi Sekiguchi | 6-1, 6-3 | | match details | Japan F1 | Hard |
| 15.03.10 | 1/4 | Shuichi Sekiguchi | Weerapat Doakmaiklee | 2-6, 7-65, 6-1 | | match details | ||
| 15.03.10 | 1st round | Shuichi Sekiguchi | Kosuke Naruse | 6-3, 6-1 | | match details | ||
| 15.03.10 | 2nd round | Shuichi Sekiguchi | Hiroyasu Ehara | 7-5, 6-2 | | match details | ||
| 07.09.09 | 1st round | Pierre-Hugues Herbert | Shuichi Sekiguchi | 3-6, 6-3, 6-3 | | match details | U.S. Open | Hard |
| 27.01.09 | 2nd round | Jordan Szabo | Shuichi Sekiguchi | 7-64, 5-7, 6-4 | | match details | Australian Open | Hard |
| 25.01.09 | 1st round | Shuichi Sekiguchi | Jordan Kelly-Houston | 6-2, 6-1 | | match details | ||
| 17.11.08 | q 1 | Kento Takeuchi | Shuichi Sekiguchi | 6-4, 6-2 | | match details | Yokohama | Hard |