Stadium: Court 8 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Daegu | 2019/06/03 02:40 | Ken Onishi v Sin Woo Lee | 6-1,6-7,10-1 |
| 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 Korea F6 | 2018/08/30 03:00 | Oh-Hee Kwon v Seong-Gook Oh | 4-6,1-6 |
| ITF Korea F6 | 2018/08/28 02:00 | Oh-Hee Kwon v Daisuke Sumizawa | 6-1,6-4 |
| ITF Korea F5 | 2018/08/22 02:00 | Oh-Hee Kwon v Hong Chung | 3-6,1-6 |
| ITF Korea F5 | 2018/08/21 03:00 | Jumpei Yamasaki v Oh-Hee Kwon | 4-6,4-6 |
| ITF Korea F4 | 2018/08/16 01:00 | Seong-Gook Oh v Oh-Hee Kwon | 6-4,6-4 |
| ITF Korea F4 | 2018/08/14 02:30 | Oh-Hee Kwon v Seong Taek Im | 6-3,6-4 |
| ITF Korea F3 | 2018/06/22 03:00 | Yunseong Chung v Oh-Hee Kwon | 6-4,6-1 |
| ITF Korea F3 | 2018/06/20 02:30 | Oh-Hee Kwon v Seong Chan Hong | 7-5,6-4 |