Ground: Hardcourt outdoor
| ITF Japan F2 | 2015/03/15 01:00 | Ryota Tanuma v Ken Onishi | 2-6,6-4,3-6 |
| ITF Japan F1 | 2015/03/13 01:00 | Ken Onishi v Yuya Kibi | 6-2,2-6,4-6 |
| ITF Japan F1 | 2015/03/12 01:00 | Arata Onozawa v Ken Onishi | 3-6,6-1,5-7 |
| ITF Japan F1 | 2015/03/11 01:00 | Takumi Tsunematsu v Ken Onishi | 3-6,3-6 |
| ITF Japan F1 | 2015/03/09 00:40 | Yohei Ono v Ken Onishi | 2-6,1-6 |
| ITF Australia F2 | 2015/03/04 02:55 | Brydan Klein v Ken Onishi | 6-3,6-2 |
| ITF Australia F2 Qual | 2015/03/01 23:30 | Ken Onishi v Blazo N Djurovic | 6-3,7-6 |
| ITF Australia F1 | 2015/02/24 01:00 | Ken Onishi v Gavin Van Peperzeel | 3-6,4-6 |
| ITF Indonesia F2 | 2015/04/08 07:40 | Aaron Cortes Alcaraz v Shuichi Sekiguchi | 2-6,2-6 |
| ITF Japan F4 | 2015/04/02 01:00 | Zhe Li v Shuichi Sekiguchi | 6-4,2-6,6-2 |
| ITF Japan F4 | 2015/04/01 01:00 | Ryotaro Matsumura v Shuichi Sekiguchi | 2-6,4-6 |
| ITF Japan F4 | 2015/03/30 05:00 | Arata Onozawa v Shuichi Sekiguchi | 4-6,4-6 |
| ITF Japan F3 | 2015/03/27 03:25 | Di Wu v Shuichi Sekiguchi | 1-6,7-5,6-2 |
| ITF Japan F3 | 2015/03/26 01:00 | Takashi Saito v Shuichi Sekiguchi | 3-6,6-7 |
| ITF Japan F3 | 2015/03/24 02:10 | Yusuke Watanuki v Shuichi Sekiguchi | 1-6,3-6 |
| ITF Turkey F2 | 2015/01/17 07:00 | Jose Pereira v Shuichi Sekiguchi | 6-3,7-5 |