Ground: Hardcourt outdoor
| ITF Guam F1 | 2015/05/26 00:00 | Hiromasa Oku v Masaki Sasai | 6-1,6-1 |
| ITF Thailand F9 | 2015/04/28 03:00 | Yuichi Ito v Hiromasa Oku | 6-4,2-6,4-6 |
| ITF Thailand F9 | 2015/04/22 07:50 | Hiromasa Oku v Yong-Kyu Lim | 3-6,1-6 |
| 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 Guam F1 | 2015/05/24 02:00 | Winter Meagher v Masayoshi Ono | 2-6,2-6 |
| ITF Greece F6 | 2015/04/27 09:20 | Stephanos Schinas v Masayoshi Ono | 6-7,6-4,6-1 |
| ITF Greece F5 | 2015/04/18 08:30 | Delf Gohlke v Masayoshi Ono | 6-7,6-2,6-2 |
| ITF Japan F4 | 2015/03/28 03:00 | Masaki Sasai v Masayoshi Ono | 6-4,6-1 |
| ITF Japan F1 | 2015/03/07 01:00 | Yohei Ono v Masayoshi Ono | 6-4,7-6 |
| ITF Greece F9 Qual | 2014/11/11 09:40 | Masayoshi Ono v Tomislav Jotovski | 4-6,2-6 |
| ITF Greece F10 Qual | 2014/10/25 07:00 | Masayoshi Ono v Nils Brinkmann | 5-7,2-6 |
| ITF Greece F8 | 2014/10/11 08:30 | Masayoshi Ono v Jessy Kalambay | 7-5,4-6,6-7 |