Ground: Hardcourt outdoor
| ITF Japan F3 | 2015/03/21 02:30 | Hiromasa Oku v Κάιτο Ουεσούγκι | 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 | Γκένκο Κικούτσι v Hiromasa Oku | 6-7,6-4,6-2 |
| ITF Japan F8 | 2014/06/26 03:30 | Hiromasa Oku v Γιοσίτο Νισιόκα | 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 Japan F7 | 2014/06/21 03:20 | Yohei Ono v Hiromasa Oku | 2-6,4-6 |
| ITF Japan F2 | 2015/03/20 03:00 | Τακούτο Νίκι v Masaki Sasai | 7-5,6-3 |
| ITF Japan F2 | 2015/03/17 04:10 | Masaki Sasai v Arata Onozawa | 6-4,6-4 |
| ITF Japan F2 | 2015/03/15 01:00 | Masaki Sasai v Ισέι Οκαμούρα | 6-3,6-0 |
| ITF Japan F1 | 2015/03/12 01:00 | Τακούτο Νίκι v Masaki Sasai | 6-2,6-1 |
| ITF Japan F1 | 2015/03/10 01:00 | Masaki Sasai v Soichiro Moritani | 6-1,7-5 |
| ITF Japan F8 | 2014/06/26 04:35 | Masaki Sasai v Keisuke Watanuki | 3-6,1-6 |
| ITF Japan F8 | 2014/06/25 01:00 | Τακούτο Νίκι v Masaki Sasai | 3-6,1-6 |
| ITF Japan F8 | 2014/06/22 03:00 | Masaki Sasai v Tetsuro Habusawa | 6-1,6-0 |