| ITF Japan F5 | 2015/05/30 01:00 | Issei Okamura v Shota Iino | 6-3,2-6,6-4 |
| ITF Thailand F9 | 2015/05/06 06:35 | Tyler Hochwalt v Issei Okamura | 6-3,1-6,6-2 |
| ITF Thailand F9 | 2015/05/05 11:00 | Sidharth Rawat v Issei Okamura | 4-6,7-5,6-7 |
| ITF Thailand F9 | 2015/05/03 04:00 | Kelsey Stevenson v Issei Okamura | 6-7,4-6 |
| ITF Thailand F9 | 2015/05/02 07:30 | Issei Okamura v Ken Onoda | 6-2,6-4 |
| ITF China F4 | 2015/04/21 04:35 | Chuhan Wang v Issei Okamura | 6-4,6-4 |
| ITF China F4 Qual | 2015/04/19 02:00 | Issei Okamura v Ruikai Wang | 6-3,6-4 |
| ITF China F4 Qual | 2015/04/18 05:00 | Jun Nan Tao v Issei Okamura | 4-6,4-6 |
| ITF USA F14 | 2015/04/29 14:30 | Ryota Tanuma v Ryan Haviland | 2-6,3-6 |
| ITF Japan F4 | 2015/04/01 03:00 | Yasutaka Uchiyama v Ryota Tanuma | 6-4,6-2 |
| ITF Japan F4 | 2015/03/31 01:00 | Masato Shiga v Ryota Tanuma | 6-3,4-6,2-6 |
| ITF Japan F4 | 2015/03/28 00:30 | Ryota Tanuma v Yohei Otsuka | 6-4,6-1 |
| ITF Japan F3 | 2015/03/26 03:30 | Ryota Tanuma v Akira Santillan | 3-6,5-7 |
| ITF Japan F3 | 2015/03/25 02:10 | Ryota Tanuma v Gengo Kikuchi | 6-3,7-5 |
| ITF Japan F2 | 2015/03/15 01:00 | Ryota Tanuma v Ken Onishi | 2-6,6-4,3-6 |
| ITF Japan F2 | 2015/03/14 00:30 | Ryota Tanuma v Kazuki Nishiwaki | 6-4,6-4 |