Name: Hiromasa Oku
Country: Japan
Birthdate: 31.07.89, 34 years
ATP ranking: 893
TOP ranking's position: 724 (15.06.15, 31 points)
Points: 17
Prize money: 26058 $
Matches total: 188
Win: 82
%: 43.62 %
Country: Japan
Birthdate: 31.07.89, 34 years
ATP ranking: 893
TOP ranking's position: 724 (15.06.15, 31 points)
Points: 17
Prize money: 26058 $
Matches total: 188
Win: 82
%: 43.62 %
| year | summary | Hard | Clay | I. hard | Carpet | Grass | Acrylic |
| 2017 | 3/6 | 1/4 | 0/1 | 0/0 | 2/1 | 0/0 | 0/0 |
| 2016 | 8/18 | 6/12 | 1/4 | 1/1 | 0/1 | 0/0 | 0/0 |
| 2015 | 21/20 | 11/12 | 7/6 | 1/1 | 2/1 | 0/0 | 0/0 |
| 2014 | 21/19 | 13/12 | 3/4 | 1/1 | 4/2 | 0/0 | 0/0 |
| 2013 | 11/9 | 6/5 | 5/2 | 0/0 | 0/2 | 0/0 | 0/0 |
| 2012 | 6/5 | 2/1 | 2/2 | 2/1 | 0/0 | 0/1 | 0/0 |
| 2011 | 3/6 | 0/2 | 2/2 | 0/0 | 1/1 | 0/1 | 0/0 |
| 2010 | 4/9 | 2/4 | 2/2 | 0/0 | 0/2 | 0/0 | 0/1 |
| 2009 | 2/9 | 1/4 | 1/2 | 0/0 | 0/3 | 0/0 | 0/0 |
| 2008 | 3/3 | 3/3 | 0/0 | 0/0 | 0/0 | 0/0 | 0/0 |
| 2007 | 0/2 | 0/1 | 0/0 | 0/0 | 0/1 | 0/0 | 0/0 |
| TOTAL | 82/106 | 45/60 | 23/25 | 5/4 | 9/14 | 0/2 | 0/1 |
| perc. % | 43.62 % | 42.86 % | 47.92 % | 55.56 % | 39.13 % | 0 % | 0 % |
Hiromasa Oku / scheduled / last
| no matches found |
Hiromasa Oku form / year 2015 / surface: Hard
Hiromasa Oku / year 2015 / surface: Hard
| 15.11.15 | q 2 | Matt Reid | Hiromasa Oku | 6-4, 6-4 |  | match details |  Yokohama Challenger | Hard |
| 14.11.15 | q 1 | Hiromasa Oku | Gengo Kikuchi | 3-6, 6-4, 6-4 |  | match details | ||
| 24.08.15 | 1st round | Hiromasa Oku | Dong-Whee Choi | 2-0, Dong-Whee Choi - retired | | match details |  Korea F5 | Hard |
| 24.08.15 | 2nd round | Hiromasa Oku | Ken Onoda | 6-1, 1-1, Ken Onoda - retired | | match details | ||
| 24.08.15 | 1/2 | Hong Chung | Hiromasa Oku | 6-2, 6-1 | | match details | ||
| 24.08.15 | 1/4 | Hiromasa Oku | Min-Kyu Song | 2-6, 7-67, 0-1, Min-Kyu Song - retired | | match details | ||
| 17.08.15 | 1st round | Hiromasa Oku | Sanhui Shin | 6-1, 6-1 | | match details | Korea F4 | Hard |
| 17.08.15 | 2nd round | Jung-Woong Na | Hiromasa Oku | 6-3, 6-4 | | match details | ||
| 10.08.15 | 1st round | Yunseong Chung | Hiromasa Oku | 7-5, 6-2 | | match details | Korea F3 | Hard |
| 08.06.15 | 1st round | Keisuke Watanuki | Hiromasa Oku | 6-2, 6-3 | | match details | Japan F6 | Hard |
| 25.05.15 | 1st round | Hiromasa Oku | Masaki Sasai | 6-1, 6-1 | | match details |  Guam F1 | Hard |
| 25.05.15 | 1/4 | Takao Suzuki | Hiromasa Oku | 4-6, 7-65, 7-5 | | match details | ||
| 25.05.15 | 2nd round | Hiromasa Oku | Masayoshi Ono | 6-0, 6-2 | | match details | ||
| 27.04.15 | 1st round | Hiromasa Oku | Yuichi Ito | 4-6, 6-2, 6-4 | | match details |  Thailand F2 | Hard |
| 27.04.15 | 2nd round | Andre Dome | Hiromasa Oku | 6-3, 6-2 | | match details | ||
| 20.04.15 | 1st round | Hiromasa Oku | Jacob Grills | 2-6, 6-3, 6-1 | | match details | Thailand F1 | Hard |
| 20.04.15 | 2nd round | Yong-Kyu Lim | Hiromasa Oku | 6-3, 6-1 | | match details | ||
| 30.03.15 | 1st round | Souma Kuribayashi | Hiromasa Oku | 6-3, 6-2 | | match details | Japan F4 | Hard |
| 23.03.15 | q 1 | Hiromasa Oku | Kaito Uesugi | 6-4, 6-4 | | match details | Japan F3 | Hard |
| 23.03.15 | qual. | Masaki Sasai | Hiromasa Oku | 6-0, 1-0, Hiromasa Oku - retired | | match details | ||
| 23.03.15 | q 2 | Hiromasa Oku | Masashi Watanabe | 6-2, 6-2 | | match details | ||
| 16.03.15 | 1st round | Yutaro Matsuzaki | Hiromasa Oku | 6-2, 3-6, 7-62 | | match details | Japan F2 | Hard |
| 09.03.15 | 1st round | Yuichi Ito | Hiromasa Oku | 6-2, 6-4 | | match details | Japan F1 | Hard |