Round: 54 Ground: Clay
| ITF Japan F8 | 2014/06/26 04:35 | Masaki Sasai v Keisuke Watanuki | 3-6,1-6 |
| ITF Japan F4 | 2017/03/29 01:00 | Masaki Sasai v Yosuke Watanuki | 7-5,3-6,1-6 |
| ITF Japan F4 | 2017/03/28 01:00 | Masaki Sasai v Teppei Uesugi | 6-3,6-2 |
| ITF Japan F3 | 2017/03/18 06:00 | Hiroyasu Ehara v Masaki Sasai | 6-3,6-4 |
| ITF Japan F2 | 2017/03/17 04:00 | Masaki Sasai v Max Purcell | 3-6,2-6 |
| ITF Japan F2 | 2017/03/16 02:00 | Shintaro Imai v Masaki Sasai | 6-7,3-6 |
| ITF Japan F2 | 2017/03/14 07:45 | Masaki Sasai v Wishaya Trongcharoenchaikul | 6-3,6-3 |
| ITF Japan F2 | 2017/03/12 01:00 | Yusei Fukuoka v Masaki Sasai | 1-6,1-6 |
| ITF Japan F1 | 2017/03/08 03:55 | Peter Kobelt v Masaki Sasai | 4-6,6-4,6-1 |
| ITF Japan F5 | 2017/04/01 02:00 | Takashi Yasugami v Keisuke Watanuki | 4-6,6-2,5-7 |
| ITF Japan F4 | 2017/03/28 01:00 | Masaya Kobayashi v Keisuke Watanuki | 6-3,6-2 |
| ITF Japan F4 | 2017/03/27 01:00 | Yuga Tashiro v Keisuke Watanuki | 2-6,6-7 |
| ITF Japan F4 | 2017/03/25 03:00 | Yu Chang v Keisuke Watanuki | 7-6,3-6,4-6 |
| ITF Japan F2 | 2017/03/14 04:20 | Yusuke Takahashi v Keisuke Watanuki | 6-2,6-2 |
| ITF Japan F2 | 2017/03/13 01:00 | Kittiphong Wachiramanowong v Keisuke Watanuki | 4-6,6-7 |
| ITF Japan F2 | 2017/03/12 02:00 | Keisuke Watanuki v Shinta Fujii | 6-2,2-6,6-2 |
| ITF Japan F2 | 2017/03/11 03:00 | Yuta Kawahashi v Keisuke Watanuki | 2-6,2-6 |