Round: 26 Ground: Synthetic outdoor
| 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 | 코바야시, 마사야 v Watanuki, Keisuke | 6-3,6-2 |
| ITF Japan F4 | 2017/03/27 01:00 | 타시로, 유가 v Watanuki, Keisuke | 2-6,6-7 |
| ITF Japan F4 | 2017/03/25 03:00 | Chang, Yu v Watanuki, Keisuke | 7-6,3-6,4-6 |
| ITF Japan F7 | 2017/06/05 03:05 | 타케시마, 순로우 v Takeuchi, Kento (1987) | 1-6,1-6 |
| ITF Japan F6 | 2017/06/02 04:00 | Takeuchi, Kento (1987) v 이마이, 신타로 | 3-6,4-6 |
| ITF Japan F6 | 2017/06/01 02:00 | Takeuchi, Kento (1987) v 마사바야시, 토모히로 | 6-4,6-0 |
| ITF Japan F6 | 2017/05/31 01:00 | Takeuchi, Kento (1987) v 마사바야시, 토모히로 | 6-4,6-0 |
| ITF Japan F6 | 2017/05/30 03:55 | Takeuchi, Kento (1987) v 오카무라, 이세이 | 7-6,6-3 |
| ITF Singapore F1 | 2017/05/26 13:30 | 트롱차로엔차이쿨, 위사야 v Takeuchi, Kento (1987) | 4-6,6-4,6-3 |
| ITF Singapore F1 | 2017/05/26 02:00 | 이토, 유이치 v Takeuchi, Kento (1987) | 2-6,3-6 |
| ITF Singapore F1 | 2017/05/23 02:00 | 싱, 달윈더 v Takeuchi, Kento (1987) | 4-6,4-6 |