| 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 China F2 Qual | 2015/04/14 02:40 | Aoxiong Wang v Issei Okamura | 4-6,6-2,6-3 |