Round: 45 Ground: Hardcourt outdoor
| ITF M15 - Kofu | 2019/03/18 00:30 | Masamichi Imamura v Ryuki Matsuda | 7-5,6-3 |
| ITF Japan F4 | 2018/03/27 01:00 | Tung-Lin Wu v Ryuki Matsuda | 6-0,6-2 |
| ITF Turkey F8 | 2018/02/25 07:30 | Ryuki Matsuda v Cengiz Aksu | 2-6,1-6 |
| ITF Turkey F8 | 2018/02/24 07:00 | Alexandros Dinopoulos v Ryuki Matsuda | 2-6,1-6 |
| ITF Turkey F6 | 2018/02/13 09:50 | Anil Yuksel v Ryuki Matsuda | 6-1,6-4 |
| ITF Turkey F6 | 2018/02/12 07:00 | Ryuki Matsuda v Koray Kirci | 6-3,6-1 |
| ITF Turkey F6 | 2018/02/11 06:00 | Bogdan Borza v Ryuki Matsuda | 4-6,4-6 |
| ITF Turkey F6 | 2018/02/10 09:00 | Gustavs Lukstins v Ryuki Matsuda | 0-6,1-6 |
| ITF M15 - Kofu | 2019/03/18 00:30 | Mick Veldheer v Ken Onishi | 7-5,6-2 |
| ITF M15 - Sharm El Sheikh | 2019/03/11 08:00 | Ken Onishi v George Tsivadze | 3-6,6-2,8-10 |
| ITF M15 - Sharm El Sheikh | 2019/03/06 12:35 | Ken Onishi v George Tsivadze | 3-6,6-2,3-6 |
| ITF Pakistan F3 | 2018/12/17 05:30 | Ken Onishi v Lorenzo Bocchi | 6-7,3-6 |
| ITF Czech Republic F4 Qual | 2018/06/23 08:00 | Ken Onishi v Samuel Puskar | 3-6,3-6 |
| ITF Hungary F4 | 2018/06/12 11:25 | Patricio Heras v Ken Onishi | 3-6,6-3,6-1 |
| ITF Hungary F4 Qual | 2018/06/11 08:00 | Ken Onishi v Kristjan Tamm | 6-3,2-6,6-3 |
| ITF Hungary F4 Qual | 2018/06/10 08:00 | Ken Onishi v Boris Butulija | 6-4,6-7,6-4 |