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 | 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 Dominican Republic F2 | 2015/12/05 13:30 | Mitchell Thomas McDaniels v Masaki Osafune | 4-6,6-7 |
| ITF Dominican Republic F1 | 2015/11/28 16:00 | Conor Berg v Masaki Osafune | 6-2,3-6,7-6 |
| ITF Turkey F41 | 2015/10/13 07:00 | Marek Semjan v Masaki Osafune | 7-6,2-6,7-6 |
| ITF Turkey F36 | 2015/10/05 07:00 | Yuanfeng Li v Masaki Osafune | 7-5,6-0 |
| ITF Turkey F36 | 2015/10/04 12:00 | Masaki Osafune v Victor-Mugurel Anagnastopol | 7-5,6-0 |
| ITF China F11 Qual | 2015/07/20 02:00 | Kittiphong Wachiramanowong v Masaki Osafune | 6-0,6-1 |
| 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 |
| ITF Korea F7 | 2016/09/01 04:05 | Makoto Ochi v Arata Onozawa | 6-2,6-2 |
| ITF Korea F7 | 2016/08/31 02:00 | Jung-Woong Na v Arata Onozawa | 6-7,5-7 |
| ITF Korea F7 | 2016/08/29 02:30 | Arata Onozawa v Gengo Kikuchi | 3-6,6-2,6-3 |
| ITF Korea F8 | 2016/08/24 04:20 | Makoto Ochi v Arata Onozawa | 6-3,6-2 |