Ground: Hardcourt outdoor
| ITF Japan F6 | 2015/06/11 01:00 | Issei Okamura v Duckhee Lee | 1-6,4-6 |
| ITF Japan F6 | 2015/06/09 04:00 | Sano, Koichi 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 Tanuma, Ryota | 6-7,4-6 |
| ITF Japan F5 | 2015/05/30 01:00 | Issei Okamura v Iino, Shota | 6-3,2-6,6-4 |
| ITF Thailand F9 | 2015/05/06 06:35 | Hochwalt, Tyler 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 | 2015/06/13 05:00 | Itzstein, Zach v Klaoklang, Marut | 7-5,6-0 |
| ITF Thailand F9 | 2015/04/28 03:00 | Itzstein, Zach v Sornbutnark, Warit | 4-6,6-1,3-6 |
| ITF Thailand F9 | 2015/04/26 05:00 | Itzstein, Zach v Tanasugarn, Chaleechan | 6-4,6-0 |
| ITF Thailand F9 | 2015/04/25 04:00 | Nagao, Katsuki v Itzstein, Zach | 5-7,3-6 |
| ITF Thailand F9 | 2015/04/21 05:50 | Isarow, Pruchya v Itzstein, Zach | 6-3,6-3 |
| ITF Thailand F9 | 2015/04/19 05:00 | Itzstein, Zach v Kawin, Patcharapol | 7-6,6-1 |
| ITF Thailand F9 | 2015/04/18 07:30 | Patrombon, Jeson v Itzstein, Zach | 6-7,2-6 |
| ITF Indonesia F3 | 2015/04/15 03:00 | Itzstein, Zach v Rungkat, Christopher | 4-6,4-6 |