| ITF Japan F8 | 06/12 00:00 | 62 | Ono, Yohei v Oku, Hiromasa | 6-3,6-3 | |
| ITF Japan F7 | 06/03 04:00 | 54 | 마사바야시, 토모히로 v Oku, Hiromasa | 6-2,7-5 | |
| ITF Japan F6 | 05/30 01:00 | 25 | Oku, Hiromasa v 우, 퉁린 | 1-6,2-6 | |
| ITF Japan F5 | 04/02 01:00 | 54 | Oku, Hiromasa v 타지마, 나오키 | 1-6,0-6 | |
| ITF Japan F4 | 03/25 02:00 | 62 | Oku, Hiromasa v Osafune, Masaki | 1-6,0-6 | |
| ITF Japan F3 | 03/18 03:00 | 62 | 타시로, 유가 v Oku, Hiromasa | 6-3,6-2 | |
| ITF Korea F8 | 09/06 02:55 | 25 | 김, 영석 v Oku, Hiromasa | 6-0,6-2 | |
| ITF Korea F7 | 08/30 06:45 | 25 | Oku, Hiromasa v 이, 재문 | 3-6,6-7 | |
| ITF Korea F8 | 08/22 02:30 | 25 | 나, 정웅 v Oku, Hiromasa | 4-6,6-1,6-0 | |
| Vietnam F8, Singles | 08/01 02:00 | 44 | Oku, Hiromasa v 푸쿠다, 소라 | 2-6,3-6 | |
| Vietnam F8, Singles | 07/30 05:30 | 44 | Oku, Hiromasa v 부얀, 안수 | 5-7,6-4,7-5 | |
| ITF Japan F8 | 06/15 04:30 | 25 | 니시와키, 카즈키 v Oku, Hiromasa | 2-6,6-3,6-4 | |
| ITF Japan F7 | 06/07 03:40 | 25 | Oku, Hiromasa v 카타야마, 쇼 | 1-6,2-6 | |
| ITF Japan F6 | 06/02 01:00 | 26 | Oku, Hiromasa v Kibi, Yuya | 3-6,2-6 | |
| ITF Japan F6 | 05/31 01:00 | 25 | 니키, 타쿠토 v Oku, Hiromasa | 2-6,3-6 | |
| ITF Guam F1 | 05/24 02:00 | 25 | Oku, Hiromasa v 타케시마, 순로우 | 3-6,2-6 | |
| ITF Turkey F19 | 05/13 09:20 | 27 | Sieber, Marc v Oku, Hiromasa | 6-0,6-3 | |
| ITF Turkey F19 | 05/12 10:20 | 26 | Oku, Hiromasa v Libietis, Mikelis | Retired | |
| ITF Turkey F19 | 05/11 13:00 | 25 | Oku, Hiromasa v Statzberger, Thomas | 6-3,6-4 | |
| ITF Turkey F18 | 05/04 08:00 | 25 | Oku, Hiromasa v Yuksel, Anil | 3-6,2-6 | |
| Turkey F17, Singles Qualifying | 04/26 11:20 | 25 | 셀리크빌레크, 알투그 v Oku, Hiromasa | 6-4,2-6,7-6 | |
| ITF Japan F5 | 04/08 01:00 | 26 | Oku, Hiromasa v Kibi, Yuya | 2-6,4-6 | |
| ITF Japan F5 | 04/05 07:45 | 25 | Oku, Hiromasa v Nagao, Katsuki | 7-6,5-7,6-1 | |
| ITF Japan F4 | 03/30 03:25 | 25 | Shiga, Masato v Oku, Hiromasa | 6-4,6-3 | |
| ITF Japan F3 | 03/20 01:00 | 44 | Oku, Hiromasa v 키쿠치, 겐고 | 2-6,1-6 | |
| ITF Japan F3 | 03/19 03:45 | 44 | Oku, Hiromasa v 스스키, 코 | 5-7,7-6,7-5 | |
| ITF Japan F2 | 03/13 01:00 | 54 | Oku, Hiromasa v 이마이, 신타로 | 1-6,0-6 | |
| ITF Japan F2 | 03/12 02:00 | 54 | Oku, Hiromasa v Matsuzaki, Yutaro | 6-4,5-7,6-3 | |
| ITF Japan F1 | 03/10 01:00 | 25 | Oku, Hiromasa v 이마이, 신타로 | 6-3,2-6,1-6 | |
| ITF Japan F8 | 06/24 01:10 | - | Oku, Hiromasa v 카타야마, 쇼 | 6-7,0-6 |