| ITF Japan F5 | 2016/04/03 02:30 | Ken Onishi v Kazuki Shimizu | 6-3,6-2 |
| ITF Japan F4 | 2016/03/27 01:00 | Yosuke Watanuki v Ken Onishi | 6-2,7-6 |
| ITF Japan F3 | 2016/03/23 01:00 | Yuya Kibi v Ken Onishi | 7-6,6-1 |
| ITF Japan F3 | 2016/03/22 03:10 | Ken Onishi v Keisuke Watanuki | 2-6,6-2,7-5 |
| ITF Japan F2 | 2016/03/12 02:00 | Tung-Lin Wu v Ken Onishi | 6-2,6-2 |
| ITF Kuwait F3 | 2015/11/26 08:00 | Ken Onishi v Evgeny Karlovskiy | 3-6,2-6 |
| ITF Kuwait F3 | 2015/11/25 12:30 | Ken Onishi v Ali Ghareeb | 6-3,6-2 |
| ITF Kuwait F3 | 2015/11/23 10:15 | Sergio Martos Gornes v Ken Onishi | 4-6,1-6 |
| ITF Japan F5 | 2016/04/03 03:30 | Arvid Nordquist v Koichi Sano | 3-6,6-4,3-6 |
| ITF Japan F1 | 2016/03/05 01:00 | Yuga Tashiro v Koichi Sano | 6-2,3-6,6-3 |
| ITF Japan F8 | 2015/06/24 01:10 | Ju-Hae Moon v Koichi Sano | 6-1,6-3 |
| ITF Japan F8 | 2015/06/21 00:00 | Koichi Sano v David Barclay | 3-6,6-3,6-4 |
| ITF Japan F7 | 2015/06/18 02:15 | Hiroyasu Ehara v Koichi Sano | 6-1,6-3 |
| ITF Japan F7 | 2015/06/17 04:30 | Koichi Sano v Oh-Hee Kwon | 6-3,3-6,6-4 |
| ITF Japan F7 Qual | 2015/06/15 00:30 | Koichi Sano v Masaki Osafune | 6-4,6-2 |
| ITF Japan F6 | 2015/06/09 04:00 | Koichi Sano v Issei Okamura | 2-6,4-6 |