| ITF Guam F1 | 2015/05/29 00:00 | Oku, Hiromasa v Suzuki, Takao | 6-4,6-7,5-7 |
| ITF Guam F1 | 2015/05/27 00:00 | Oku, Hiromasa v 오노, 마사요시 | 6-0,6-2 |
| ITF Guam F1 | 2015/05/26 00:00 | Oku, Hiromasa v Sasai, Masaki | 6-1,6-1 |
| ITF Thailand F9 | 2015/04/28 03:00 | 이토, 유이치 v Oku, Hiromasa | 6-4,2-6,4-6 |
| ITF Thailand F9 | 2015/04/22 07:50 | Oku, Hiromasa v 임, 영규 | 3-6,1-6 |
| ITF Thailand F9 | 2015/04/20 03:00 | 그릴스, 야콥 v Oku, Hiromasa | 6-2,3-6,1-6 |
| ITF Japan F3 | 2015/03/21 02:30 | Oku, Hiromasa v 우스기, 카이토 | 6-4,6-4 |
| ITF Japan F2 | 2015/03/16 01:00 | Matsuzaki, Yutaro v Oku, Hiromasa | 6-2,3-6,7-6 |
| ITF Guam F1 | 2015/05/28 00:00 | Sano, Koichi v 스스키, 코 | 2-6,1-6 |
| ITF Guam F1 | 2015/05/26 03:40 | 데스코트, 마티아스 프란코 v Sano, Koichi | 2-6,6-7 |
| ITF Japan F6 Qual | 2014/06/09 03:00 | Watanuki, Keisuke v Sano, Koichi | 6-4,6-0 |
| ITF Japan F6 Qual | 2014/06/07 00:00 | Fukuoka, Yusei v Sano, Koichi | 0-6,2-6 |
| ITF Japan F5 | 2014/06/03 02:30 | Sano, Koichi v Kibi, Yuya | 4-6,2-6 |
| ITF Guam F1 | 2014/05/27 02:45 | Nedunchezhiyan, Jeevan v Sano, Koichi | 6-2,6-4 |