| ITF Japan F7 | 2014/06/21 03:20 | Yohei Ono v Hiromasa Oku | 2-6,4-6 |
| 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 F3 | 2015/03/22 01:00 | Tetsuro Habusawa v Yohei Ono | 1-6,2-6 |
| ITF Japan F2 | 2015/03/15 01:00 | Yohei Ono v Soichiro Moritani | 6-2,2-6,2-6 |
| ITF Japan F1 | 2015/03/09 00:40 | Yohei Ono v Ken Onishi | 2-6,1-6 |
| ITF Japan F1 | 2015/03/07 01:00 | Yohei Ono v Masayoshi Ono | 6-4,7-6 |
| ITF Japan F7 | 2014/06/21 03:20 | Yohei Ono v Hiromasa Oku | 2-6,4-6 |
| ITF Japan F7 | 2014/06/20 02:30 | Yohei Ono v Chih-Jen Ho | 4-6,6-3,6-2 |
| 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 |
| ITF Vietnam F8 | 2016/08/01 02:00 | Hiromasa Oku v Sora Fukuda | 2-6,3-6 |
| ITF Vietnam F8 | 2016/07/30 05:30 | Hiromasa Oku v Ansu Bhuyan | 5-7,6-4,7-5 |
| ITF Japan F8 | 2016/06/15 04:30 | Kazuki Nishiwaki v Hiromasa Oku | 2-6,6-3,6-4 |
| ITF Japan F7 | 2016/06/07 03:40 | Hiromasa Oku v Sho Katayama | 1-6,2-6 |
| ITF Japan F6 | 2016/06/02 01:00 | Hiromasa Oku v Yuya Kibi | 3-6,2-6 |