Ground: Hardcourt outdoor
| ITF Japan F2 | 2015/03/15 01:00 | Masaki Sasai v Issei Okamura | 6-3,6-0 |
| ITF Japan F1 | 2015/03/09 00:40 | Shintaro Imai v Issei Okamura | 6-0,6-1 |
| ITF Japan F8 | 2014/06/24 02:40 | Issei Okamura v Yoshihito Nishioka | 0-6,3-6 |
| ITF Japan F7 | 2014/06/17 02:05 | Issei Okamura v Gengo Kikuchi | 4-6,2-6 |
| ITF Japan F5 | 2014/06/02 01:00 | Issei Okamura v Katsuki Nagao | 1-6,6-7 |
| ITF Japan F4 | 2014/04/04 01:00 | Issei Okamura v Masato Shiga | 0-6,3-6 |
| ITF Japan F4 | 2014/04/02 02:45 | Issei Okamura v Masaki Sasai | 6-3,6-3 |
| ITF Japan F4 | 2014/04/01 03:45 | Yuichi Ito v Issei Okamura | 7-6,2-6,6-7 |
| ITF Japan F2 | 2015/03/14 00:30 | Soichiro Moritani v Keisuke Watanuki | 6-4,6-2 |
| ITF Japan F1 | 2015/03/09 00:40 | Jarryd Chaplin v Keisuke Watanuki | 6-4,4-6,7-6 |
| ITF Turkey F34 | 2014/09/28 07:00 | Katsuki Nagao v Keisuke Watanuki | 6-3,5-7,7-6 |
| ITF Turkey F34 | 2014/09/27 07:00 | Keisuke Watanuki v Pavel Shchaya-Zubrov | 6-0,6-4 |
| ITF Turkey F32 | 2014/09/17 11:20 | Keisuke Watanuki v Antoine Bellier | 1-6,3-6 |
| ITF Turkey F31 | 2014/09/10 08:30 | Keisuke Watanuki v Nicolaas Scholtz | 3-6,1-6 |
| ITF Turkey F31 | 2014/09/08 07:30 | Keisuke Watanuki v Ren Nakamura | 6-3,6-0 |
| ITF Japan F8 | 2014/06/27 01:00 | Keisuke Watanuki v Arata Onozawa | 3-6,4-6 |