Round: 26 Ground: Clay
| ITF Japan F8 | 2017/06/14 01:00 | Yuto Sakai v Yohei Ono | 7-5,6-0 |
| ITF Japan F8 | 2017/06/12 00:00 | Luca Castelnuovo v Yuto Sakai | 7-6,4-6,6-7 |
| ITF Japan F8 | 2017/06/11 03:00 | Yuto Sakai v Shinji Hazawa | 6-1,6-4 |
| ITF Japan F6 | 2017/06/01 04:10 | Yuto Sakai v Sora Fukuda | 6-7,3-6 |
| ITF Japan F6 | 2017/05/31 01:00 | Yuto Sakai v Sora Fukuda | 6-7,3-6 |
| ITF Japan F6 | 2017/05/30 03:30 | Yuto Sakai v Arata Onozawa | 7-6,7-5 |
| 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 F8 | 2017/06/14 01:00 | Tetsuro Habusawa v Yusuke Watanuki | 3-6,3-6 |
| ITF Japan F7 | 2017/06/06 01:00 | Takuto Niki v Yusuke Watanuki | 5-7,7-5,6-4 |
| ITF Japan F6 | 2017/05/29 05:50 | Yusuke Watanuki v Shintaro Imai | 0-6,5-7 |
| ITF Japan F5 | 2017/04/09 03:30 | Yusuke Watanuki v Masato Shiga | 6-7,5-7 |
| ITF Japan F5 | 2017/04/09 03:00 | Yusuke Watanuki v Masato Shiga | 6-7,5-7 |
| ITF Japan F5 | 2017/04/07 04:30 | Yusuke Watanuki v Shintaro Imai | 6-1,6-3 |
| ITF Japan F5 | 2017/04/05 00:30 | Takao Suzuki v Yusuke Watanuki | 2-6,1-6 |
| ITF Japan F5 | 2017/04/04 04:30 | Yusuke Watanuki v Masaki Sasai | 6-2,6-2 |