Round: 62 Ground: Clay
| ITF Japan F7 | 2017/06/08 01:30 | Watanuki, Keisuke v Takeuchi, Kento (1987) | 3-6,5-7 |
| ITF Japan F6 Qual | 2017/05/29 01:00 | Watanuki, Keisuke v Sakai, Yuto | 6-7,6-7 |
| ITF Japan F6 Qual | 2017/05/28 07:00 | Watanuki, Keisuke v Sakai, Yuto | 6-7,6-7 |
| ITF Japan F6 Qual | 2017/05/27 01:00 | Watanuki, Keisuke v Han, Sung Min | 6-4,6-0 |
| ITF Japan F5 | 2017/04/02 01:00 | Sasai, Masaki v Watanuki, Keisuke | 6-2,6-4 |
| ITF Japan F5 | 2017/04/01 02:00 | Yasugami, Takashi v Watanuki, Keisuke | 4-6,6-2,5-7 |
| ITF Japan F4 | 2017/03/28 01:00 | Masaya Kobayashi v Watanuki, Keisuke | 6-3,6-2 |
| ITF Japan F4 | 2017/03/27 01:00 | Tashiro, Yuga v Watanuki, Keisuke | 2-6,6-7 |