Stadium: Court 8 Round: 62 Ground: Clay
| ITF Japan F6 Qual | 2018/04/08 01:00 | Issei Okamura v Hikaru Shiraishi | 6-4,6-3 |
| ITF Japan F5 | 2018/03/31 03:30 | Issei Okamura v Yuta Kawahashi | 3-6,1-6 |
| ITF Japan F4 | 2018/03/26 01:00 | Issei Okamura v Shao-Fan Liu | 3-6,5-7 |
| ITF Japan F4 | 2018/03/24 04:00 | Issei Okamura v Kousuke Ogura | 6-3,7-5 |
| ITF Japan F3 | 2018/03/19 06:40 | Issei Okamura v Makoto Ochi | 6-7,3-6 |
| ITF Japan F3 | 2018/03/18 01:30 | Issei Okamura v Masaki Sasai | 6-3,6-1 |
| ITF Japan F3 | 2018/03/17 04:00 | Issei Okamura v Arata Onozawa | 7-6,6-0 |
| ITF Japan F2 | 2018/03/15 02:35 | Issei Okamura v Kaito Uesugi | 4-6,5-7 |
| ITF Japan F6 Qual | 2018/04/08 01:00 | Ryuhei Azuma v Yuto Sakai | 2-6,2-6 |
| 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 |