Round: 54 Ground: Clay
| ITF Japan F5 | 2016/04/06 03:40 | Keisuke Watanuki v Sho Katayama | 2-6,5-7 |
| ITF Japan F4 | 2016/03/29 05:10 | Keisuke Watanuki v Shintaro Imai | 3-6,6-3,1-6 |
| ITF Japan F4 | 2016/03/28 01:00 | Gengo Kikuchi v Keisuke Watanuki | 2-6,7-5,6-7 |
| ITF Japan F4 | 2016/03/27 01:00 | Yusuke Takahashi v Keisuke Watanuki | 4-6,3-6 |
| ITF Japan F3 | 2016/03/22 03:10 | Ken Onishi v Keisuke Watanuki | 2-6,6-2,7-5 |
| ITF Japan F3 | 2016/03/20 02:30 | Masato Shiga v Keisuke Watanuki | 4-6,6-2,3-6 |
| ITF Japan F3 | 2016/03/19 03:45 | Rigele Te v Keisuke Watanuki | 2-6,1-6 |
| ITF Japan F2 | 2016/03/15 04:30 | Keisuke Watanuki v Yuya Kibi | 2-6,6-4,1-6 |
| ITF Japan F1 | 2016/03/05 01:00 | Shin Yoshida v Weiqiang Zheng | 6-7,7-6,6-1 |