| ITF Japan F2 | 2015/03/15 01:00 | Ryota Tanuma v Ken Onishi | 2-6,6-4,3-6 |
| ITF Japan F4 | 2017/03/30 01:00 | Ken Onishi v Yosuke Watanuki | 2-6,5-7 |
| ITF Japan F4 | 2017/03/29 01:00 | Masaya Kobayashi v Ken Onishi | 4-6,6-7 |
| Challenger Bangkok 2 Qual | 2017/01/07 08:15 | Ken Onishi v Jimmy Wang | 1-6,4-6 |
| ITF Hong Kong F1 | 2017/01/05 02:00 | Ken Onishi v Takuto Niki | 4-6,1-6 |
| ITF Hong Kong F1 | 2017/01/04 04:50 | Ken Onishi v Pak Long Yeung | 6-4,6-2 |
| ITF Hong Kong F1 | 2017/01/02 02:00 | Ken Onishi v Jui-Chen Hung | 6-3,7-5 |
| ITF Hong Kong F5 | 2016/12/27 23:00 | Jumpei Yamasaki v Ken Onishi | 7-6,6-4 |
| ITF Hong Kong F5 | 2016/12/26 23:00 | Wei-De Lin v Ken Onishi | 6-7,3-6 |
| ITF Japan F4 | 2017/03/31 01:00 | Ryota Tanuma v Yusuke Takahashi | 3-6,2-6 |
| ITF Japan F4 | 2017/03/30 03:15 | Ryota Tanuma v Masaki Osafune | 7-5,3-6,6-3 |
| ITF Japan F4 | 2017/03/29 05:20 | Masato Shiga v Ryota Tanuma | 4-6,1-6 |
| ITF Japan F3 | 2017/03/20 01:00 | Ryota Tanuma v Wishaya Trongcharoenchaikul | 3-6,2-6 |
| ITF China F3 | 2017/02/28 06:05 | Danilo Petrovic v Ryota Tanuma | 7-6,6-4 |
| ITF China F2 | 2017/02/24 03:00 | Ryota Tanuma v Fernando Romboli | 3-6,5-7 |
| ITF China F2 | 2017/02/23 05:40 | Danilo Petrovic v Ryota Tanuma | 6-7,6-4,6-7 |
| ITF China F2 | 2017/02/21 05:00 | Rigele Te v Ryota Tanuma | 6-7,1-6 |