Ground: Hardcourt outdoor
| ITF Japan F4 | 2014/04/02 02:45 | Issei Okamura v Sasai, Masaki | 6-3,6-3 |
| ITF Japan F1 | 2015/03/12 01:00 | Niki, Takuto v Sasai, Masaki | 6-2,6-1 |
| ITF Japan F1 | 2015/03/10 01:00 | Sasai, Masaki v Moritani, Soichiro | 6-1,7-5 |
| ITF Japan F8 | 2014/06/26 04:35 | Sasai, Masaki v Watanuki, Keisuke | 3-6,1-6 |
| ITF Japan F8 | 2014/06/25 01:00 | Niki, Takuto v Sasai, Masaki | 3-6,1-6 |
| ITF Japan F8 | 2014/06/22 03:00 | Sasai, Masaki v Habusawa, Tetsuro | 6-1,6-0 |
| ITF Japan F7 | 2014/06/19 01:00 | Mclachlan, Ben v Sasai, Masaki | 6-3,6-4 |
| ITF Japan F7 | 2014/06/17 01:00 | Sasai, Masaki v Moritani, Soichiro | 6-1,1-6,6-4 |
| ITF Japan F6 Qual | 2014/06/08 07:30 | Sasai, Masaki v Ushida, Atsushi | 1-6,3-6 |
| 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 Kikuchi, Gengo | 4-6,2-6 |
| ITF Japan F5 | 2014/06/02 01:00 | Issei Okamura v Nagao, Katsuki | 1-6,6-7 |
| ITF Japan F4 | 2014/04/04 01:00 | Issei Okamura v Shiga, Masato | 0-6,3-6 |
| ITF Japan F4 | 2014/04/02 02:45 | Issei Okamura v Sasai, Masaki | 6-3,6-3 |
| ITF Japan F4 | 2014/04/01 03:45 | Ito, Yuichi v Issei Okamura | 7-6,2-6,6-7 |
| ITF Japan F3 | 2014/03/27 03:55 | Kibi, Yuya v Issei Okamura | 6-1,6-1 |