Round: 62 Ground: Clay
| ITF Japan F8 | 2017/06/10 04:00 | Keisuke Watanuki v Taketo Takamisawa | 4-6,6-2,6-3 |
| ITF Japan F7 | 2017/06/08 01:30 | Keisuke Watanuki v Kento Takeuchi | 3-6,5-7 |
| ITF Japan F6 Qual | 2017/05/29 01:00 | Keisuke Watanuki v Yuto Sakai | 6-7,6-7 |
| ITF Japan F6 Qual | 2017/05/28 07:00 | Keisuke Watanuki v Yuto Sakai | 6-7,6-7 |
| ITF Japan F6 Qual | 2017/05/27 01:00 | Keisuke Watanuki v Sung Min Han | 6-4,6-0 |
| ITF Japan F5 | 2017/04/02 01:00 | Masaki Sasai v Keisuke Watanuki | 6-2,6-4 |
| ITF Japan F5 | 2017/04/01 02:00 | Takashi Yasugami v Keisuke Watanuki | 4-6,6-2,5-7 |
| ITF Japan F4 | 2017/03/28 01:00 | Masaya Kobayashi v Keisuke Watanuki | 6-3,6-2 |
| ITF Japan F8 | 2017/06/11 00:00 | James Trotter v Kazuki Nishiwaki | 6-7,4-6 |
| ITF Japan F8 | 2017/06/10 04:00 | Kenta Kurita v Kazuki Nishiwaki | 1-6,5-7 |
| ITF Singapore F2 Qual | 2017/05/28 04:00 | Kazuki Nishiwaki v Ken Onoda | 5-7,6-1,1-6 |
| ITF Singapore F1 | 2017/05/25 02:00 | Issei Okamura v Kazuki Nishiwaki | 6-7,1-6 |
| ITF Singapore F1 Qual | 2017/05/22 06:10 | Kazuki Nishiwaki v Vignesh Peranamallur | 6-1,6-1 |
| ITF Singapore F1 Qual | 2017/05/21 04:00 | Yu Hsiang Chiu v Kazuki Nishiwaki | 0-6,2-6 |
| ITF Japan F5 | 2017/04/03 05:00 | Kazuki Nishiwaki v Tung-Lin Wu | 3-6,5-7 |
| ITF Japan F5 | 2017/04/02 01:00 | Tomohiro Masabayashi v Kazuki Nishiwaki | 1-6,6-7 |