Stadium: Court 5 Round: 25
| ITF Japan F5 | 2017/04/03 06:20 | Ken Onishi v Ryota Tanuma | 6-7,2-6 |
| ITF Japan F2 | 2015/03/15 01:00 | Ryota Tanuma v Ken Onishi | 2-6,6-4,3-6 |
| ITF Malaysia F1 | 2017/10/18 02:10 | Ken Onishi v Suraj R Prabodh | 3-6,4-6 |
| ITF Turkey F36 | 2017/09/28 07:30 | Thomas Statzberger v Ken Onishi | 6-1,6-2 |
| ITF Turkey F36 | 2017/09/27 07:30 | Alexander Erler v Ken Onishi | 4-6,6-4,2-6 |
| ITF Turkey F35 | 2017/09/21 09:00 | Ken Onishi v Kevin Kaczynski | 4-6,6-7 |
| ITF Turkey F35 | 2017/09/20 11:30 | Vit Kopriva v Ken Onishi | 4-6,6-1,2-6 |
| ITF Turkey F34 | 2017/09/15 12:40 | Ken Onishi v Patricio Heras | 1-6,1-6 |
| ITF Turkey F34 | 2017/09/14 13:25 | Ken Onishi v Anton Desyatnik | 6-4,6-7,6-1 |
| ITF Turkey F34 | 2017/09/12 10:30 | Ken Onishi v Jannis Kahlke | 6-7,7-6,6-0 |
| ITF Malaysia F1 | 2017/10/21 01:00 | Jurabek Karimov v Ryota Tanuma | 6-4,6-2 |
| ITF Malaysia F1 | 2017/10/20 01:00 | Ryota Tanuma v Takashi Saito | 7-6,3-6,7-6 |
| ITF Malaysia F1 | 2017/10/19 01:00 | Mikalai Haliak v Ryota Tanuma | 0-6,0-6 |
| ITF Malaysia F1 | 2017/10/17 01:00 | Ryota Tanuma v Kunal Anand | 6-2,6-4 |
| ITF Turkey F36 | 2017/09/25 07:30 | Ryota Tanuma v Philipp Schroll | 3-6,3-6 |
| ITF Turkey F36 | 2017/09/24 07:30 | Ryota Tanuma v Laelson Rodrigues | 6-1,6-0 |
| ITF Turkey F35 | 2017/09/21 07:30 | Ryota Tanuma v Johann Willems | 7-6,0-6,1-6 |
| ITF Turkey F35 | 2017/09/19 07:30 | Antun Vidak v Ryota Tanuma | 4-6,2-6 |