Round: 25 Ground: Hardcourt outdoor
| ITF Japan F1 | 2014/03/11 02:55 | Arata Onozawa v Masaki Osafune | 4-6,6-1,6-3 |
| ITF Japan F4 | 2017/03/28 02:00 | Masaki Osafune v Rio Noguchi | 1-6,7-6,6-3 |
| ITF Japan F4 | 2017/03/25 02:00 | Hiromasa Oku v Masaki Osafune | 1-6,0-6 |
| ITF Japan F3 | 2017/03/18 03:00 | Masaya Kobayashi v Masaki Osafune | 7-6,6-7,6-4 |
| ITF Japan F2 | 2017/03/12 02:00 | Kittiphong Wachiramanowong v Masaki Osafune | 6-3,6-4 |
| ITF Japan F2 | 2017/03/11 03:00 | Masaki Osafune v Artem Vu | 6-2,6-1 |
| ITF Japan F1 | 2017/03/05 01:00 | Masaki Osafune v Keisuke Watanuki | 6-7,6-0,2-6 |
| ITF Japan F4 | 2016/03/27 01:00 | Katsuki Nagao v Masaki Osafune | 6-1,6-2 |
| ITF Dominican Republic F2 | 2015/12/06 14:00 | Juan Carlos Aguilar v Masaki Osafune | 7-5,6-3 |
| ITF Japan F3 | 2017/03/19 01:00 | Arata Onozawa v Rimpei Kawakami | 3-6,6-2,2-6 |
| ITF Japan F3 | 2017/03/18 06:00 | Arata Onozawa v Sota Fujii | 6-4,6-3 |
| Challenger Kyoto Qual | 2017/02/19 05:25 | Jimmy Wang v Arata Onozawa | 6-3,6-4 |
| Challenger Kyoto Qual | 2017/02/18 07:35 | Arata Onozawa v Yusuke Takahashi | 6-3,6-7,6-3 |
| Others | 2016/11/12 07:35 | Kento Takeuchi v Arata Onozawa | 7-6,6-2 |
| Others | 2016/11/12 02:10 | Ken Onishi v Arata Onozawa | 3-6,4-6 |
| ITF Vietnam F4 | 2016/09/15 03:00 | Arata Onozawa v Congsup Congcar | 5-7,4-6 |
| ITF Vietnam F4 | 2016/09/12 03:00 | Arata Onozawa v Koichi Sano | 2-6,7-6,6-0 |