Round: 54 Ground: Clay
| ITF Japan F5 | 2016/04/06 03:40 | Watanuki, Keisuke v 카타야마, 쇼 | 2-6,5-7 |
| ITF Japan F4 | 2016/03/29 05:10 | Watanuki, Keisuke v 이마이, 신타로 | 3-6,6-3,1-6 |
| ITF Japan F4 | 2016/03/28 01:00 | 키쿠치, 겐고 v Watanuki, Keisuke | 2-6,7-5,6-7 |
| ITF Japan F4 | 2016/03/27 01:00 | 타카하시, 유스케 v Watanuki, Keisuke | 4-6,3-6 |
| ITF Japan F3 | 2016/03/22 03:10 | 오니시, 켄 v Watanuki, Keisuke | 2-6,6-2,7-5 |
| ITF Japan F3 | 2016/03/20 02:30 | Shiga, Masato v Watanuki, Keisuke | 4-6,6-2,3-6 |
| ITF Japan F3 | 2016/03/19 03:45 | 테, 리겔 v Watanuki, Keisuke | 2-6,1-6 |
| ITF Japan F2 | 2016/03/15 04:30 | Watanuki, Keisuke v Kibi, Yuya | 2-6,6-4,1-6 |
| ITF Japan F1 | 2016/03/05 01:00 | Yoshida, Shin v 정, 웨이치앙 | 6-7,7-6,6-1 |