Round: 44 Ground: Hardcourt outdoor
| ITF Japan F3 | 2018/03/17 00:30 | Takahiro Kubo v Kousuke Ogura | 0-6,0-6 |
| ITF Japan F2 | 2018/03/11 00:30 | Kousuke Ogura v Shinta Fujii | 6-2,5-7,6-7 |
| ITF Japan F2 | 2018/03/10 00:30 | Cheong Hwi Kim v Kousuke Ogura | 5-7,2-6 |
| ITF Japan F1 | 2018/03/03 01:00 | Kousuke Ogura v James Trotter | 3-6,3-6 |
| ITF Japan F8 | 2017/06/10 00:00 | Kousuke Ogura v Taisei Ichikawa | 2-6,2-6 |
| ITF Japan F7 | 2017/06/03 01:00 | Kousuke Ogura v Masaya Kobayashi | 1-6,4-6 |
| ITF Japan F4 | 2017/03/25 01:00 | Kousuke Ogura v Rio Noguchi | 2-6,1-6 |
| ITF Japan F3 | 2017/03/18 03:00 | Kousuke Ogura v Yusei Fukuoka | 2-6,4-6 |
| 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 |
| ITF Turkey F7 | 2018/02/18 06:30 | Orlando Luz v Yuto Sakai | 6-1,6-7,4-6 |