| ITF Japan F5 | 04/01 00:30 | 54 | チウ,ユ・シン v Osafune, Masaki | 6-2,6-2 | |
| ITF Japan F5 | 03/31 00:30 | 54 | Osafune, Masaki v 脇田 俊輔 | 6-7,6-3,6-0 | |
| ITF Japan F4 | 03/25 05:00 | 62 | Osafune, Masaki v チウ,ユ・シン | 2-6,4-6 | |
| ITF Japan F2 | 03/12 00:30 | 44 | モリタニ,ソウイチロウ v Osafune, Masaki | 7-6,6-0 | |
| ITF Japan F1 | 03/06 01:00 | 62 | 白藤成 v Osafune, Masaki | 6-0,6-3 | |
| ITF Japan F1 | 03/03 04:30 | 62 | キム,チョン・ウィ v Osafune, Masaki | 1-6,1-6 | |
| Challenger Kyoto Qual | 02/18 06:05 | 46 | Osafune, Masaki v 仁木 拓人 | 3-6,2-6 | |
| Challenger Toyota Qual | 11/11 02:15 | 45 | サカイ,ユウト v Osafune, Masaki | 7-6,1-6,6-1 | |
| ITF Guam F1 | 06/22 03:25 | 26 | Osafune, Masaki v イトウ,ユウイチ | 2-6,4-6 | |
| ITF Guam F1 | 06/20 06:00 | 25 | Osafune, Masaki v Goh, Steven | 6-3,6-4 | |
| ITF Japan F8 | 06/11 00:00 | 62 | Osafune, Masaki v 住澤大輔 住澤大輔 | Retired | |
| ITF Japan F7 | 06/06 04:05 | 25 | 徳田 廉大 v Osafune, Masaki | 6-1,3-6,6-1 | |
| ITF Japan F7 | 06/04 01:00 | 54 | Osafune, Masaki v Kato, Shoma | 6-3,6-3 | |
| ITF Japan F6 Qual | 05/29 03:40 | 54 | Matsuo, Yuki v Osafune, Masaki | 7-6,6-2 | |
| ITF China F7 | 05/17 03:40 | 26 | デイン ケリー v Osafune, Masaki | 6-1,6-1 | |
| ITF China F7 | 05/16 05:30 | 25 | Hung, Jui-Chen v Osafune, Masaki | 2-6,6-1,2-6 | |
| ITF China F7 Qual | 05/15 03:55 | 62 | ワン・チュカン v Osafune, Masaki | 7-5,4-6,1-6 | |
| ITF China F7 Qual | 05/14 02:55 | 62 | Osafune, Masaki v カラム パターギル | 7-5,6-1 | |
| ITF China F7 Qual | 05/13 06:30 | 62 | ルイス・クラーク v Osafune, Masaki | 1-6,5-7 | |
| ITF China F6 | 05/09 03:10 | 25 | Osafune, Masaki v 柏 衍(バイ・イェン) | 2-6,2-6 | |
| ITF China F6 Qual | 05/08 03:25 | 62 | Osafune, Masaki v 河内 一真 | 6-2,6-4 | |
| ITF China F6 Qual | 05/07 01:30 | 62 | Osafune, Masaki v チェン,リアン | 6-3,6-3 | |
| ITF China F6 Qual | 05/06 04:30 | 62 | Gong, Xiao v Osafune, Masaki | 6-0,4-6,5-7 | |
| ITF Japan F4 | 03/30 03:15 | 26 | 田沼 諒太 v Osafune, Masaki | 7-5,3-6,6-3 | |
| ITF Japan F4 | 03/29 05:10 | 25 | Osafune, Masaki v Onozawa, Arata | Retired | |
| ITF Japan F4 | 03/28 02:00 | 62 | Osafune, Masaki v 野口 莉央 | 1-6,7-6,6-3 | |
| ITF Japan F4 | 03/25 02:00 | 62 | Oku, Hiromasa v Osafune, Masaki | 1-6,0-6 | |
| ITF Japan F3 | 03/18 03:00 | 62 | 小林 雅哉 v Osafune, Masaki | 7-6,6-7,6-4 | |
| ITF Japan F2 | 03/12 02:00 | 44 | Wachiramanowong, Kittiphong v Osafune, Masaki | 6-3,6-4 | |
| ITF Japan F2 | 03/11 03:00 | 44 | Osafune, Masaki v Vu, Artem | 6-2,6-1 |