| ITF Japan F7 | 2015/06/16 02:15 | Arata Onozawa v Keisuke Watanuki | 7-6,0-6,6-3 |
| ITF Japan F6 | 2015/06/11 02:55 | Takuto Niki v Keisuke Watanuki | 6-7,7-6,6-4 |
| ITF Japan F6 | 2015/06/10 01:30 | Keisuke Watanuki v Hiromasa Oku | 6-2,6-3 |
| ITF Japan F5 | 2015/06/04 02:00 | Thomas Fancutt v Keisuke Watanuki | 7-5,7-6 |
| ITF Japan F5 | 2015/06/03 06:30 | Ryotaro Matsumura v Keisuke Watanuki | 6-2,4-6,0-6 |
| ITF Greece F9 | 2015/04/29 10:05 | David Simunek v Keisuke Watanuki | 6-4,6-2 |
| ITF Greece F5 | 2015/04/23 07:00 | Tom Kocevar-Desman v Keisuke Watanuki | 6-3,6-2 |
| ITF Greece F5 | 2015/04/21 10:40 | Charalampos Kapogiannis v Keisuke Watanuki | 6-3,1-6,5-7 |
| ITF Japan F6 | 2015/06/09 07:45 | Yuichi Ito v Kento Takeuchi | 2-6,0-6 |
| ITF Japan F5 | 2015/06/04 01:00 | Hiromasa Oku v Yuichi Ito | 6-0,6-1 |
| ITF Japan F5 | 2015/06/03 06:00 | Yuichiro Inui v Yuichi Ito | 3-6,3-6 |
| ITF Thailand F9 | 2015/05/05 08:30 | Yuichi Ito v Tyler Hochwalt | 4-6,6-3,3-6 |
| ITF Thailand F9 | 2015/04/28 03:00 | Yuichi Ito v Hiromasa Oku | 6-4,2-6,4-6 |
| ITF Japan F4 | 2015/04/01 03:20 | Yuichi Ito v Takuto Niki | 1-6,4-6 |
| ITF Japan F4 | 2015/03/30 05:00 | Yuichi Ito v Gengo Kikuchi | 1-6,6-3,6-3 |
| ITF Japan F3 | 2015/03/25 03:00 | Masato Shiga v Yuichi Ito | 3-6,6-3,5-7 |