Stadium: Indoor D1 Round: 62 Ground: Clay
| ITF Japan F8 | 2018/06/09 01:00 | Sakai, Yuto v Mariyappa, Arjun | 6-0,6-0 |
| ITF Japan F6 Qual | 2018/04/09 01:00 | Issei Okamura v Sakai, Yuto | 6-2,6-3 |
| ITF Japan F6 Qual | 2018/04/08 01:00 | Azuma, Ryuhei v Sakai, Yuto | 2-6,2-6 |
| ITF Japan F3 | 2018/03/17 02:30 | Kousuke Ogura v Sakai, Yuto | 6-4,6-3 |
| ITF Japan F2 | 2018/03/13 04:00 | Tanaka, Yunosuke v Sakai, Yuto | 6-4,4-6,7-6 |
| ITF Japan F2 | 2018/03/12 00:30 | Sakai, Yuto v Takeshima, Shunrou | 6-4,6-2 |
| ITF Japan F2 | 2018/03/11 04:00 | Kikuchi, Gengo v Sakai, Yuto | 2-6,2-6 |
| ITF Japan F2 | 2018/03/10 04:00 | Sakai, Yuto v Bang Shuo Yin | 6-3,6-2 |
| ITF Japan F7 | 2018/06/07 02:00 | Kikuchi, Gengo v Tashiro, Yuga | 6-2,6-2 |
| ITF Japan F7 | 2018/06/05 02:45 | Tashiro, Yuga v Shinji Hazawa | 7-5,7-6 |
| ITF Japan F7 Qual | 2018/06/03 02:45 | Taisei Miyamoto v Tashiro, Yuga | 5-7,4-6 |
| ITF Japan F7 Qual | 2018/06/02 01:00 | Uesugi, Teppei v Tashiro, Yuga | 1-6,6-7 |
| ITF Japan F4 | 2018/03/25 01:00 | Jumpei Yamasaki v Tashiro, Yuga | 6-2,6-3 |
| ITF Japan F3 | 2018/03/17 04:00 | Tashiro, Yuga v Takeshima, Shunrou | 6-7,6-1,2-6 |
| ITF Japan F3 | 2018/03/17 00:30 | Tashiro, Yuga v Kishi, Ryota | 6-7,6-3,6-0 |
| ITF Japan F2 | 2018/03/10 00:30 | Tashiro, Yuga v Yasugami, Takashi | 6-7,6-2,4-6 |