Round: 62 Ground: Hardcourt outdoor
| ITF Japan F3 | 2017/03/18 03:00 | Tashiro, Yuga v Oku, Hiromasa | 6-3,6-2 |
| ITF Korea F8 | 2016/09/06 02:55 | Kim, Young Seok v Oku, Hiromasa | 6-0,6-2 |
| ITF Korea F7 | 2016/08/30 06:45 | Oku, Hiromasa v Jeamoon Lee | 3-6,6-7 |
| ITF Korea F8 | 2016/08/22 02:30 | Na, Jung-Woong v Oku, Hiromasa | 4-6,6-1,6-0 |
| ITF Vietnam F8 | 2016/08/01 02:00 | Oku, Hiromasa v Sora Fukuda | 2-6,3-6 |
| ITF Vietnam F8 | 2016/07/30 05:30 | Oku, Hiromasa v Bhuyan, Ansu | 5-7,6-4,7-5 |
| ITF Japan F8 | 2016/06/15 04:30 | Kazuki Nishiwaki v Oku, Hiromasa | 2-6,6-3,6-4 |
| ITF Japan F7 | 2016/06/07 03:40 | Oku, Hiromasa v Katayama, Sho | 1-6,2-6 |
| ITF Japan F3 | 2017/03/18 03:00 | Masaya Kobayashi v Osafune, Masaki | 7-6,6-7,6-4 |
| ITF Japan F2 | 2017/03/12 02:00 | Wachiramanowong, Kittipong v Osafune, Masaki | 6-3,6-4 |
| ITF Japan F2 | 2017/03/11 03:00 | Osafune, Masaki v Vu, Artem | 6-2,6-1 |
| ITF Japan F1 | 2017/03/05 01:00 | Osafune, Masaki v Watanuki, Keisuke | 6-7,6-0,2-6 |
| ITF Japan F4 | 2016/03/27 01:00 | Nagao, Katsuki v Osafune, Masaki | 6-1,6-2 |
| ITF Dominican Republic F2 | 2015/12/06 14:00 | Juan Carlos Aguilar v Osafune, Masaki | 7-5,6-3 |
| ITF Dominican Republic F2 | 2015/12/05 13:30 | Mcdaniels, Mitchell Thomas v Osafune, Masaki | 4-6,6-7 |
| ITF Dominican Republic F1 | 2015/11/28 16:00 | Berg, Conor v Osafune, Masaki | 6-2,3-6,7-6 |