Round: 26 Ground: Hardcourt outdoor
| ITF Japan F6 MD | 2017/06/01 03:55 | Matsui/Rungkat v Watanuki/Watanuki | 6-4,6-2 |
| ITF Japan F6 MD | 2017/05/31 05:30 | Watanuki/Watanuki v Kikuchi/Takeshima | 6-4,6-7,10-6 |
| ITF Japan F6 MD | 2017/05/30 08:05 | Okamura/Takeuchi v Watanuki/Watanuki | 4-6,3-6 |
| ITF Japan F3 MD | 2017/03/23 05:30 | Watanuki/Watanuki v Ehara/Niki | 6-7,6-7 |
| ITF Japan F3 MD | 2017/03/20 07:20 | Watanuki/Watanuki v Moritani/Shiga | 6-3,6-3 |
| Challenger Toyota MD | 2016/11/14 05:30 | Watanuki/Watanuki v Ratiwatana/Yi | 3-6,4-6 |
| Challenger Kobe MD | 2016/11/10 05:00 | Masur/Pavic v Watanuki/Watanuki | 2-6,6-3,10-5 |
| Challenger Kobe MD | 2016/11/07 06:10 | Watanuki/Watanuki v Peng/Uchiyama | 2-6,6-3,11-9 |