Round: 62 Ground: Clay
| ITF Japan F7 | 2017/06/06 04:05 | Renta Tokuda v Masaki Osafune | 6-1,3-6,6-1 |
| ITF Japan F7 | 2017/06/04 01:00 | Masaki Osafune v Shoma Kato | 6-3,6-3 |
| ITF Japan F6 Qual | 2017/05/29 03:40 | Yuki Matsuo v Masaki Osafune | 7-6,6-2 |
| ITF China F7 | 2017/05/17 03:40 | Dayne Kelly v Masaki Osafune | 6-1,6-1 |
| ITF China F7 | 2017/05/16 05:30 | Jui-Chen Hung v Masaki Osafune | 2-6,6-1,2-6 |
| ITF China F7 Qual | 2017/05/15 03:55 | Chukang Wang v Masaki Osafune | 7-5,4-6,1-6 |
| ITF China F7 Qual | 2017/05/14 02:55 | Masaki Osafune v Calum Puttergill | 7-5,6-1 |
| ITF China F7 Qual | 2017/05/13 06:30 | Louis Clark v Masaki Osafune | 1-6,5-7 |
| ITF Japan F8 | 2017/06/10 00:00 | Daisuke Sumizawa v Takuya Komura | 6-4,6-0 |
| ITF Japan F7 | 2017/06/03 01:00 | Daisuke Sumizawa v Luca Castelnuovo | 3-6,3-6 |
| ITF Japan F6 Qual | 2017/05/29 03:00 | Yuga Tashiro v Daisuke Sumizawa | 6-1,6-1 |
| ITF Japan F6 Qual | 2017/05/28 06:00 | Yuga Tashiro v Daisuke Sumizawa | 6-1,6-1 |
| ITF Japan F6 Qual | 2017/05/27 01:00 | Yuichiro Inui v Daisuke Sumizawa | 2-6,3-6 |
| ITF Japan F5 | 2017/04/01 02:00 | Rimpei Kawakami v Daisuke Sumizawa | 7-5,6-4 |
| ITF Japan F4 | 2017/03/27 08:00 | Daisuke Sumizawa v Tomohiro Masabayashi | 0-6,0-6 |
| ITF Japan F3 | 2017/03/20 02:35 | Daisuke Sumizawa v Issei Okamura | 2-6,2-6 |