Round: 25 Ground: Hardcourt outdoor
| ITF Japan F4 | 2017/03/28 01:00 | Masaya Kobayashi v Keisuke Watanuki | 6-3,6-2 |
| ITF Japan F4 | 2017/03/27 01:00 | Masaya Kobayashi v Aoran Wang | 7-6,7-6 |
| ITF Japan F3 | 2017/03/20 01:00 | Masaya Kobayashi v Chan-Yeong Oh | 4-6,2-6 |
| ITF Japan F3 | 2017/03/19 01:00 | Masaya Kobayashi v Yunosuke Tanaka | 5-7,6-2,6-1 |
| ITF Japan F3 | 2017/03/18 08:00 | Masaya Kobayashi v Yuta Kawahashi | 6-2,7-5 |
| ITF Japan F3 | 2017/03/18 03:00 | Masaya Kobayashi v Masaki Osafune | 7-6,6-7,6-4 |
| ITF Japan F2 | 2017/03/14 02:30 | Masaya Kobayashi v Xin Gao | 4-6,2-6 |
| ITF Japan F1 | 2017/03/09 03:40 | Masaya Kobayashi v Wishaya Trongcharoenchaikul | 0-6,3-6 |
| 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 - M15 Monastir | 2016/11/12 02:10 | Ken Onishi v Arata Onozawa | 3-6,4-6 |
| Challenger - Kobe | 2016/11/09 05:00 | Ken Onishi v Go Soeda | 0-6,6-7 |