| ITF Japan F7 | 2014/06/21 03:20 | Yohei Ono v Hiromasa Oku | 2-6,4-6 |
| ITF Japan F8 | 2017/06/11 00:00 | Yuichiro Inui v Yohei Ono | 6-7,2-6 |
| ITF Japan F4 | 2017/03/28 01:00 | Yohei Ono v Tomohiro Masabayashi | 3-6,2-6 |
| ITF Japan F4 | 2017/03/25 03:00 | Koichi Sano v Yohei Ono | 3-6,1-6 |
| ITF Japan F3 | 2017/03/18 00:30 | Collin Johns v Yohei Ono | 7-5,6-2 |
| ITF Japan F1 | 2017/03/06 01:00 | Yohei Ono v Shinta Fujii | 5-7,5-7 |
| ITF Japan F1 | 2017/03/05 01:00 | Yohei Ono v Yohei Otsuka | 6-3,6-3 |
| ITF Japan F1 | 2017/03/04 01:00 | Collin Johns v Yohei Ono | 3-6,6-4,5-7 |
| ITF Japan F3 | 2015/03/23 01:00 | Akira Santillan v Yohei Ono | 6-3,6-0 |
| ITF Japan F7 | 2017/06/03 04:00 | Tomohiro Masabayashi v Hiromasa Oku | 6-2,7-5 |
| ITF Japan F6 | 2017/05/30 01:00 | Hiromasa Oku v Tung-Lin Wu | 1-6,2-6 |
| ITF Japan F5 | 2017/04/02 01:00 | Hiromasa Oku v Naoki Tajima | 1-6,0-6 |
| ITF Japan F4 | 2017/03/25 02:00 | Hiromasa Oku v Masaki Osafune | 1-6,0-6 |
| ITF Japan F3 | 2017/03/18 03:00 | Yuga Tashiro v Hiromasa Oku | 6-3,6-2 |
| ITF Korea F8 | 2016/09/06 02:55 | Young Seok Kim v Hiromasa Oku | 6-0,6-2 |
| ITF Korea F7 | 2016/08/30 06:45 | Hiromasa Oku v Jeamoon Lee | 3-6,6-7 |
| ITF Korea F8 | 2016/08/22 02:30 | Jung-Woong Na v Hiromasa Oku | 4-6,6-1,6-0 |