Stadium: Court 2 Round: 54 Ground: Hardcourt outdoor
| Yokohama, Japan, Qualifying | 2018/02/25 01:00 | Banes, Maverick v Jumpei Yamasaki | 6-2,1-6,4-6 |
| Yokohama, Japan, Qualifying | 2018/02/24 01:00 | Takeuchi, Kento (1987) 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 Egypt F3 | 2018/01/29 08:00 | Jumpei Yamasaki v Lechevretel, Louis | 6-3,6-4 |
| ITF Egypt F3 | 2018/01/28 08:00 | Jumpei Yamasaki v Ren Nakamura | 6-1,7-5 |
| ITF Egypt F2 | 2018/01/20 08:00 | Lechevretel, Louis v Jumpei Yamasaki | 4-6,7-6,6-4 |
| ITF Egypt F1 | 2018/01/16 08:00 | Jumpei Yamasaki v Hiroki Moriya | 1-6,4-6 |
| ITF Hong Kong F6 | 2018/01/03 03:40 | Jumpei Yamasaki v Reboul, Fabien | 5-7,4-6 |
| Yokohama, Japan, Qualifying | 2018/02/25 01:00 | Masamichi Imamura v Wishaya Trongcharoenchaikul | 6-1,6-4 |
| ITF Japan F6 | 2017/05/29 04:25 | Renta Tokuda v Masamichi Imamura | 6-4,6-0 |
| ITF Japan F5 | 2017/04/03 02:25 | Masamichi Imamura v Oh, Chan-Yeong | 6-7,6-4,3-6 |
| ITF Japan F5 | 2017/04/01 01:00 | Itsusaki, Kaito v Masamichi Imamura | 3-6,4-6 |
| ITF Japan F3 | 2017/03/18 08:00 | Masamichi Imamura v Nagao, Katsuki | 2-6,1-6 |
| ITF Japan F3 | 2017/03/18 05:00 | Masamichi Imamura v Takuya Kumasaka | 7-6,7-5 |
| Yokohama, Japan, Qualifying | 2017/02/25 06:25 | Ehara, Hiroyasu v Masamichi Imamura | 6-3,6-4 |