| ITF Japan F2 | 2018/03/10 02:30 | Tomohiro Masabayashi v Ryuhei Azuma | 6-4,6-3 |
| ITF Japan F1 | 2018/03/04 01:00 | Naru Shirafuji v Ryuhei Azuma | 6-2,6-2 |
| ITF Japan F3 | 2018/03/17 02:30 | Kousuke Ogura v Yuto Sakai | 6-4,6-3 |
| ITF Japan F2 | 2018/03/13 04:00 | Yunosuke Tanaka v Yuto Sakai | 6-4,4-6,7-6 |
| ITF Japan F2 | 2018/03/12 00:30 | Yuto Sakai v Shunrou Takeshima | 6-4,6-2 |
| ITF Japan F2 | 2018/03/11 04:00 | Gengo Kikuchi v Yuto Sakai | 2-6,2-6 |
| ITF Japan F2 | 2018/03/10 04:00 | Yuto Sakai v Bang Shuo Yin | 6-3,6-2 |
| ITF Turkey F7 | 2018/02/20 11:30 | Yuto Sakai v Chun Hsin Tseng | 6-4,2-6,1-6 |
| ITF Turkey F7 | 2018/02/19 08:00 | Yuto Sakai v Kazuki Shimizu | 6-2,6-3 |
| ITF Turkey F7 | 2018/02/18 11:00 | Yuto Sakai v Franco Capalbo | 6-4,6-1 |