Stadium: Court 3 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Taipei | 2019/07/16 03:35 | Ti Chen v Han-Chih Lin | 6-4,7-6 |
| 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 |
| ITF M15 Gimcheon | 2019/06/12 01:00 | Ken Onishi v Cing-Yang Meng | 6-4,6-4 |
| ITF M15 Gimcheon | 2019/06/11 01:00 | Ken Onishi v Seung-Hun Shin | 7-6,6-3 |
| ITF M15 Daegu | 2019/06/05 01:00 | Ken Onishi v Oh-Hee Kwon | 2-6,2-6 |
| 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 |