Stadium: Court 13 Round: 25 Ground: Hardcourt outdoor
| Challenger Kobe | 2016/11/08 02:00 | Makoto Ochi v Ken Onishi | 3-6,1-6 |
| ITF M15 Nonthaburi | 2019/12/08 03:00 | Danylo Kalenichenko v Makoto Ochi | 6-4,6-4 |
| ITF M15 Nonthaburi | 2019/12/07 05:25 | Dominik Palan v Makoto Ochi | 4-6,6-7 |
| ITF M15 Nonthaburi | 2019/12/06 04:10 | Alexander Crnokrak v Makoto Ochi | 6-7,3-6 |
| ITF M15 Nonthaburi | 2019/12/05 02:30 | Hong Chung v Makoto Ochi | 7-5,6-7,2-6 |
| ITF M15 Nonthaburi | 2019/12/03 05:30 | Keisuke Saitoh v Makoto Ochi | 2-6,2-6 |
| ITF M15 Nonthaburi | 2019/11/28 04:25 | Makoto Ochi v Sora Fukuda | 4-6,1-6 |
| ITF M15 Nonthaburi | 2019/11/26 06:00 | Makoto Ochi v Alexander Crnokrak | 6-4,6-4 |
| Challenger Liuzhou | 2019/10/23 04:55 | Denis Istomin v Makoto Ochi | 7-6,6-3 |
| ITF M15 Hong Kong | 2020/01/07 04:45 | Kousuke Ogura v Ken Onishi | 5-7,4-6 |
| ITF M15 Hong Kong | 2020/01/06 02:00 | Shohei Chikami v Ken Onishi | 4-6,1-6 |
| ITF M15 Te Anau | 2019/12/30 23:00 | Elliot Benchetrit v Ken Onishi | 7-5,6-1 |
| Challenger Kobe | 2019/11/06 01:30 | Luke Saville v Ken Onishi | 6-2,6-2 |
| ITF M25 Taipei | 2019/07/22 04:00 | Han-Chih Lin v Ken Onishi | 6-7,6-3,10-6 |
| ITF M25 Taipei | 2019/07/15 02:00 | Hao-Hsiang Liao v Ken Onishi | 7-6,7-6 |
| ITF M15 Gimcheon | 2019/06/17 05:20 | Ju-Hae Moon v Ken Onishi | 2-6,6-3,10-6 |
| ITF M15 Gimcheon | 2019/06/13 01:30 | Ken Onishi v Seong Chan Hong | 1-6,2-6 |