Round: 44 Ground: Hardcourt outdoor
| ITF Japan F2 | 2018/03/11 00:30 | Jumpei Yamasaki v Takashi Yasugami | 6-0,6-3 |
| ITF Japan F1 | 2018/03/08 07:15 | Jumpei Yamasaki v Yuki Mochizuki | 1-6,3-6 |
| ITF Japan F1 | 2018/03/06 02:00 | Kaichi Uchida v Jumpei Yamasaki | 6-1,6-7,3-6 |
| Challenger Yokohama | 2018/02/27 04:45 | Jumpei Yamasaki v Stephane Robert | 6-3,1-6,3-6 |
| Challenger Yokohama Qual | 2018/02/26 01:00 | Jumpei Yamasaki v Masamichi Imamura | 4-6,7-6,6-4 |
| Challenger Yokohama Qual | 2018/02/25 01:00 | Maverick Banes v Jumpei Yamasaki | 6-2,1-6,4-6 |
| Challenger Yokohama Qual | 2018/02/24 01:00 | Kento Takeuchi v Jumpei Yamasaki | 3-6,3-6 |
| ITF Egypt F3 | 2018/01/31 16:40 | Jumpei Yamasaki v Riccardo Bonadio | 2-6,6-7 |
| ITF Japan F1 | 2018/03/07 03:15 | Yuki Mochizuki v Naru Shirafuji | 6-4,6-3 |
| ITF Japan F1 | 2018/03/06 01:00 | Naru Shirafuji v Masaki Osafune | 6-0,6-3 |
| ITF Japan F1 | 2018/03/04 01:00 | Naru Shirafuji v Ryuhei Azuma | 6-2,6-2 |
| ITF Japan F1 | 2018/03/03 03:00 | Naru Shirafuji v Keigo Shimizu | 6-2,6-1 |
| Challenger Kyoto Qual | 2018/02/17 04:45 | Hiroyasu Ehara v Naru Shirafuji | 7-5,6-2 |
| ITF Egypt F4 | 2018/02/05 09:00 | Naru Shirafuji v Vincent Stouff | 0-6,2-6 |
| ITF Egypt F4 | 2018/02/04 15:00 | Naru Shirafuji v Arsav Mohanty | 6-2,6-3 |
| ITF Egypt F3 | 2018/01/29 08:00 | Daniil Zarichanskiy v Naru Shirafuji | 7-6,6-4 |