| ITF Japan F6 | 2015/06/09 04:00 | Koichi Sano v Issei Okamura | 2-6,4-6 |
| ITF Japan F6 Qual | 2015/06/08 01:00 | Yuichiro Inui v Issei Okamura | 3-6,1-6 |
| ITF Japan F5 | 2015/06/01 04:10 | Issei Okamura v Ryota Tanuma | 6-7,4-6 |
| 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 Japan F6 | 2015/06/09 05:00 | Ju-Hae Moon v Duckhee Lee | 1-6,1-6 |
| ITF China F6 | 2015/05/30 05:00 | Yan Bai v Duckhee Lee | 6-4,6-1 |
| ITF China F6 | 2015/05/30 02:00 | Duckhee Lee v Kento Takeuchi | 6-1,6-4 |
| ITF China F6 | 2015/05/27 02:00 | Duckhee Lee v Cheng-Yu Yu | 6-4,6-4 |
| ITF China F6 | 2015/05/26 02:00 | Duckhee Lee v Michael Geerts | 7-5,6-3 |
| ITF China F6 | 2015/05/22 02:00 | Duckhee Lee v Michael Geerts | 6-0,4-6,4-6 |
| ITF China F6 | 2015/05/21 02:00 | Duckhee Lee v Chu-Huan Yi | 6-4,3-6,6-0 |
| ITF China F6 | 2015/05/19 06:15 | Duckhee Lee v Xiao Gong | 6-4,6-4 |