Stadium: Court 4 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Tabarka | 2019/05/15 12:40 | Ken Onishi v Nicolas Bianchi | 6-4,1-6,4-6 |
| ITF M15 Tabarka | 2019/05/09 08:30 | Ken Onishi v Mathieu Perchicot | 0-6,0-6 |
| ITF M15 Tabarka | 2019/05/08 09:40 | Kazuma Kawachi v Ken Onishi | 7-6,5-7,0-6 |
| ITF M15 Tabarka | 2019/05/01 11:10 | Florian Lakat v Ken Onishi | 6-3,4-6,6-0 |
| ITF M15 Tabarka | 2019/04/29 08:00 | Mason Recci v Ken Onishi | 4-6,1-6 |
| ITF M25 Matsuyama | 2019/04/09 02:50 | Gage Brymer v Ken Onishi | 7-6,6-2 |
| ITF M15 Tsukuba | 2019/03/25 01:00 | Ryuki Matsuda v Ken Onishi | 6-2,6-3 |
| ITF M15 Kofu | 2019/03/18 00:30 | Mick Veldheer v Ken Onishi | 7-5,6-2 |