Ground: Clay
| ITF Japan F6 | 2014/06/13 03:25 | Takashi Saito v Yusuke Watanuki | 7-6,6-2 |
| ITF Japan F6 | 2015/06/09 04:00 | Yusuke Watanuki v Renta Tokuda | 7-5,2-6,6-2 |
| ITF Japan F4 | 2015/04/02 01:00 | Hiroyasu Ehara v Yusuke Watanuki | 6-3,2-6,6-2 |
| ITF Japan F4 | 2015/04/01 01:00 | Jumpei Yamasaki v Yusuke Watanuki | 6-7,3-6 |
| ITF Japan F4 | 2015/03/31 01:00 | Akira Santillan v Yusuke Watanuki | 4-6,6-0,5-7 |
| ITF Japan F3 | 2015/03/24 02:10 | Yusuke Watanuki v Shuichi Sekiguchi | 1-6,3-6 |
| ITF Tunisia F5 | 2015/02/05 10:20 | Yusuke Watanuki v Marko Tepavac | 3-6,0-6 |
| ITF Tunisia F5 | 2015/02/03 08:30 | Yusuke Watanuki v Pietro Licciardi | 6-3,6-7,6-2 |
| ITF Tunisia F5 | 2015/01/30 10:30 | Yusuke Watanuki v Jaime Pulgar-Garcia | 2-6,4-6 |
| ITF Japan F6 | 2015/06/09 04:00 | Ben Mclachlan v Takashi Saito | 5-7,4-6 |
| ITF Japan F5 | 2015/06/06 03:00 | Takashi Saito v Hiromasa Oku | 6-3,6-1 |
| ITF Japan F5 | 2015/06/05 01:00 | Takashi Saito v Thomas Fancutt | 6-2,6-3 |
| ITF Japan F5 | 2015/06/04 01:00 | Takashi Saito v Shunrou Takeshima | 7-5,6-1 |
| ITF Japan F5 | 2015/06/03 06:30 | Takashi Saito v Masaki Sasai | 6-0,6-2 |
| ITF Spain F14 | 2015/05/21 10:50 | Tommy Paul v Takashi Saito | 7-5,6-4 |
| ITF Japan F4 | 2015/03/31 01:00 | Takashi Saito v Takuto Niki | 5-7,7-5,3-6 |
| ITF Japan F3 | 2015/03/26 01:00 | Takashi Saito v Shuichi Sekiguchi | 3-6,6-7 |