Ground: Hardcourt outdoor
| ITF Thailand F9 | 2015/04/20 03:00 | Jacob Grills v Hiromasa Oku | 6-2,3-6,1-6 |
| ITF Japan F3 | 2015/03/21 02:30 | Hiromasa Oku v Kaito Uesugi | 6-4,6-4 |
| ITF Japan F2 | 2015/03/16 01:00 | Yutaro Matsuzaki v Hiromasa Oku | 6-2,3-6,7-6 |
| ITF Japan F1 | 2015/03/10 01:00 | Yuichi Ito v Hiromasa Oku | 6-2,6-4 |
| ITF Hong Kong F2 | 2014/07/14 03:30 | Gengo Kikuchi v Hiromasa Oku | 6-7,6-4,6-2 |
| ITF Japan F8 | 2014/06/26 03:30 | Hiromasa Oku v Yoshihito Nishioka | 0-6,3-6 |
| ITF Japan F8 | 2014/06/25 01:00 | Soichiro Moritani v Hiromasa Oku | 3-6,3-6 |
| ITF Japan F7 | 2014/06/22 06:40 | Yuya Kibi v Hiromasa Oku | 6-4,6-3 |
| ITF Thailand F9 | 2015/04/21 05:25 | Sho Katayama v Yong-Kyu Lim | 4-6,3-6 |
| ITF Japan F4 | 2015/04/02 03:15 | Yong-Kyu Lim v Takuto Niki | 2-6,2-6 |
| ITF Japan F4 | 2015/03/31 01:00 | Yong-Kyu Lim v Shintaro Imai | 6-3,6-4 |
| ITF Japan F3 | 2015/03/29 01:00 | Yasutaka Uchiyama v Yong-Kyu Lim | 6-7,3-6 |
| ITF Japan F3 | 2015/03/28 01:30 | Akira Santillan v Yong-Kyu Lim | 1-6,3-6 |
| ITF Japan F3 | 2015/03/27 02:25 | Yong-Kyu Lim v Takuto Niki | 7-6,7-5 |
| ITF Japan F3 | 2015/03/26 01:00 | Seong Chan Hong v Yong-Kyu Lim | 2-6,6-4,4-6 |
| ITF Japan F3 | 2015/03/24 01:00 | Yong-Kyu Lim v Soichiro Moritani | 7-6,6-3 |