Round: 62 Ground: Hardcourt outdoor
| ITF Japan F8 | 2015/06/25 01:00 | Keisuke Numajiri v Keisuke Watanuki | 3-6,3-6 |
| ITF Japan F8 | 2015/06/24 02:45 | Keisuke Watanuki v Yuichi Ito | 6-1,7-5 |
| 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 Dominican Republic F2 | 2015/12/06 15:00 | Yuichiro Inui v Benjamin Hannestad | 0-6,1-6 |
| ITF Dominican Republic F1 | 2015/11/30 15:00 | Yuichiro Inui v Martin Cuevas | 1-6,3-6 |
| ITF Australia F8 | 2015/10/12 01:45 | Yuichiro Inui v David Barclay | 1-6,7-6,1-6 |
| ITF Chinese Taipei F1 | 2015/08/23 01:30 | Yuichiro Inui v Ching-Huang Tsai | 6-7,5-7 |
| ITF Japan F7 | 2015/06/17 01:30 | Hiroyasu Ehara v Yuichiro Inui | 6-4,6-0 |
| ITF Japan F6 Qual | 2015/06/08 01:00 | Yuichiro Inui v Issei Okamura | 3-6,1-6 |
| ITF Japan F6 Qual | 2015/06/07 05:00 | Yuichiro Inui v Yusei Fukuoka | 2-6,7-5,6-4 |
| ITF Japan F5 | 2015/06/03 06:00 | Yuichiro Inui v Yuichi Ito | 3-6,3-6 |