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 / surface: Carpet
Hiromasa Oku / surface: Carpet
| 12.06.17 | q 2 | Hiromasa Oku | Kodai Hirayama | 6-0, 6-2 |  | match details |  Japan F8 | Carpet |
| 12.06.17 | qual. | Yohei Ono | Hiromasa Oku | 6-3, 6-3 |  | match details | ||
| 12.06.17 | q 1 | Hiromasa Oku | So Hanatani | 6-4, 6-4 | | match details | ||
| 15.06.16 | 1st round | Kazuki Nishiwaki | Hiromasa Oku | 2-6, 6-3, 6-4 | | match details | Japan F8 | Carpet |
| 15.06.15 | 1st round | Hiromasa Oku | Ku Keon Kang | 6-2, 6-1 | | match details | Japan F7 | Carpet |
| 15.06.15 | 2nd round | Hiromasa Oku | Makoto Ochi | 6-4, 6-3 | | match details | ||
| 15.06.15 | 1/4 | Yusuke Watanuki | Hiromasa Oku | 6-2, 6-3 | | match details | ||
| 15.11.14 | q 1 | Shunrou Takeshima | Hiromasa Oku | 6-2, 6-2 | | match details | Toyota Challenger | Carpet |
| 16.06.14 | 2nd round | Hiromasa Oku | Arata Onozawa | 6-4, 1-0, Arata Onozawa - retired | | match details | Japan F7 | Carpet |
| 16.06.14 | fin | Yuuya Kibi | Hiromasa Oku | 6-4, 6-3 | | match details | ||
| 16.06.14 | 1/4 | Hiromasa Oku | Chieh-Fu Wang | 6-3, 7-64 | | match details | ||
| 16.06.14 | 1/2 | Hiromasa Oku | Yohei Ono | 6-2, 6-4 | | match details | ||
| 16.06.14 | 1st round | Hiromasa Oku | Kazuya Tamura | 7-63, 6-0 | | match details | ||
| 16.11.13 | q 1 | Gengo Kikuchi | Hiromasa Oku | 6-4, 7-65 | | match details | Toyota Challenger | Carpet |
| 17.06.13 | q 1 | Keisuke Watanuki | Hiromasa Oku | 1-6, 6-4, 6-1 | | match details | Japan F6 | Carpet |
| 07.03.11 | q 2 | Sho Katayama | Hiromasa Oku | 2-6, 6-2, 6-3 | | match details | Kyoto Challenger | Carpet |
| 07.03.11 | q 1 | Hiromasa Oku | Yuuya Kibi | 4-6, 7-65, 7-5 | | match details | ||
| 21.06.10 | 1st round | Masato Hatanaka | Hiromasa Oku | 4-6, 6-4, 6-2 | | match details | Japan F7 | Carpet |
| 14.06.10 | 1st round | Toshihide Matsui | Hiromasa Oku | 6-3, 6-2 | | match details | Japan F6 | Carpet |
| 23.11.09 | q 1 | Fumiaki Kita | Hiromasa Oku | 6-4, 6-1 | | match details | Toyota Challenger | Carpet |
| 15.06.09 | 1st round | Sho Katayama | Hiromasa Oku | 6-1, 5-7, 6-2 | | match details | Japan F5 | Carpet |
| 09.03.09 | q 1 | Masatoshi Miyazaki | Hiromasa Oku | 6-3, 6-74, 6-2 | | match details | Kyoto Challenger | Carpet |
| 02.04.07 | 1st round | Nicholas Monroe | Hiromasa Oku | 7-5, 6-2 | | match details | Japan F3 | Carpet |