| 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 |
| ITF China F2 | 2015/04/07 05:55 | Issei Okamura v Yan Bai | 0-6,1-6 |
| ITF China F2 Qual | 2015/04/06 02:00 | Issei Okamura v Zuxin Zheng | 6-0,7-6 |
| ITF Japan F4 | 2015/03/29 01:00 | Seong Chan Hong v Issei Okamura | 6-3,6-3 |
| ITF Japan F4 | 2015/03/28 05:30 | Taiki Hashimoto v Issei Okamura | 7-6,1-6,1-6 |
| ITF Thailand F9 | 2015/04/25 06:30 | Warit Sornbutnark v Ken Onoda | 6-7,7-5,6-3 |
| ITF Japan F4 | 2015/03/29 00:00 | Keisuke Numajiri v Ken Onoda | 6-0,1-6,6-3 |
| ITF Japan F1 | 2015/03/09 00:40 | Shunrou Takeshima v Ken Onoda | 6-1,6-1 |
| ITF Hong Kong F2 Qual | 2014/07/13 02:00 | David Agung Susanto v Ken Onoda | 6-3,6-2 |
| ITF Hong Kong F2 Qual | 2014/07/12 04:30 | Zheng Qi Jonathan Zhang v Ken Onoda | 4-6,2-6 |
| ITF Japan F6 Qual | 2014/06/08 07:30 | Ken Onoda v Shohei Chikami | 2-6,3-6 |
| ITF Italy F8 | 2014/04/01 08:05 | Ken Onoda v Lorenzo Papasidero | 0-6,1-6 |
| ITF Italy F6 | 2014/03/18 09:00 | Omar Giacalone v Ken Onoda | 6-2,6-1 |