Stadium: Court 5 Round: 62 Ground: Clay
| ITF M15 Cairo | 2021/01/24 11:30 | Onishi, Ken v Mathys Erhard | 6-4,6-4 |
| ITF M15 Cairo | 2021/01/17 10:00 | Roncalli, Simone v Onishi, Ken | 6-3,6-1 |
| ITF M15 Cairo | 2021/01/11 08:00 | Onishi, Ken v Simon Beaupain | 3-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2020/02/24 10:00 | Asrawy, Amr v Onishi, Ken | 4-6,6-0,10-8 |
| ITF - M15 Sharm El Sheikh | 2020/02/17 09:00 | Piotr Grynkowski v Onishi, Ken | 6-1,6-4 |
| Hong Kong, Simples M-ITF-HKG-01A | 2020/01/08 09:30 | Makoto Ochi v Onishi, Ken | 7-6,6-2 |
| Hong Kong, Simples M-ITF-HKG-01A | 2020/01/07 04:45 | Kousuke Ogura v Onishi, Ken | 5-7,4-6 |
| Hong Kong, Simples M-ITF-HKG-01A | 2020/01/06 02:00 | Shohei Chikami v Onishi, Ken | 4-6,1-6 |
| ITF M15 Cairo | 2021/01/24 09:30 | Maikel De Boes v Khotkov, Oleg | 7-6,6-4 |
| ITF M15 Cairo | 2021/01/10 13:00 | Lorenzo Bocchi v Maikel De Boes | 6-2,6-1 |
| ITF - M15 Manacor | 2021/01/06 09:55 | Abedallah Shelbayh v Maikel De Boes | 6-1,6-2 |