Round: 25 Ground: Synthetic outdoor
| ITF Japan F1 | 2016/03/10 02:35 | Takuto Niki v Keisuke Watanuki | 7-5,6-2 |
| ITF Japan F6 | 2015/06/11 02:55 | Takuto Niki v Keisuke Watanuki | 6-7,7-6,6-4 |
| ITF Japan F3 | 2014/03/26 02:50 | Takuto Niki v Keisuke Watanuki | 6-3,6-1 |
| ITF Japan F6 | 2016/05/31 05:25 | Yusuke Takahashi v Keisuke Watanuki | 6-3,6-4 |
| ITF Japan F6 Qual | 2016/05/29 04:00 | Keisuke Watanuki v Sho Shimabukuro | 6-1,6-0 |
| ITF Japan F6 Qual | 2016/05/28 01:00 | Keisuke Watanuki v Shin Yoshida | 6-1,6-4 |
| 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 F6 | 2016/05/31 01:00 | Takuto Niki v Hiromasa Oku | 2-6,3-6 |
| ITF Guam F1 | 2016/05/27 01:25 | Andrew Whittington v Takuto Niki | 4-6,6-4,6-4 |
| ITF Guam F1 | 2016/05/24 06:30 | Mark Oljaca v Takuto Niki | 4-6,0-6 |
| ITF Japan F5 | 2016/04/08 06:25 | Takuto Niki v Sho Katayama | 7-6,2-6,3-6 |
| ITF Japan F5 | 2016/04/06 03:40 | Takuto Niki v Ko Suzuki | 6-4,3-6,6-2 |
| ITF Japan F4 | 2016/03/30 01:00 | Takuto Niki v Ryota Tanuma | 4-6,5-7 |
| ITF Japan F3 | 2016/03/21 03:45 | Xin Gao v Takuto Niki | 2-6,6-2,6-2 |
| ITF Japan F2 | 2016/03/15 02:25 | Takuto Niki v Yunseong Chung | 3-6,6-3,3-6 |