Ground: Hardcourt outdoor
| ITF Japan F4 | 2015/03/29 01:00 | Seong Chan Hong v Issei Okamura | 6-3,6-3 |
| ITF Japan F4 | 2015/03/28 05:30 | Taiki Hashimoto v Issei Okamura | 7-6,1-6,1-6 |
| ITF Japan F3 | 2015/03/21 02:30 | Issei Okamura v Keisuke Watanuki | 6-2,6-3 |
| 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 China F2 Qual | 2015/03/31 02:00 | Zuxin Zheng v Ruikai Wang | 0-6,0-6 |
| ITF China F2 Qual | 2015/03/30 02:00 | YiShuo Fan v Zuxin Zheng | 3-6,0-6 |