| UTR Pro Yokohama | 2025/01/27 04:00 | Jumpei Yamasaki v Issei Okamura | 6-2,7-5 |
| ITF M15 Nishi-Tokyo | 2024/03/18 03:30 | Jumpei Yamasaki v Issei Okamura | 6-2,6-1 |
| ITF M25 Matsuyama | 2019/04/10 07:00 | Jumpei Yamasaki v Issei Okamura | 6-4,5-7,1-6 |
| ITF M15 Kashiwa | 2019/04/04 01:00 | Issei Okamura v Jumpei Yamasaki | 3-6,2-6 |
| ITF Thailand F3 | 2016/09/07 02:00 | Issei Okamura v Jumpei Yamasaki | 6-4,2-6,4-6 |
| UTR Pro Yokohama | 2025/02/01 08:05 | Jumpei Yamasaki v Koki Matsuda | 6-4,6-4 |
| UTR Pro Yokohama | 2025/02/01 01:50 | Jumpei Yamasaki v Yuichiro Inui | 6-7,7-5,6-0 |
| UTR Pro Yokohama | 2025/01/30 01:00 | Jumpei Yamasaki v Daiki Sato | 6-0,6-4 |
| UTR Pro Yokohama | 2025/01/29 01:00 | Jumpei Yamasaki v Natsuki Yamamoto | 6-4,7-5 |
| UTR Pro Yokohama | 2025/01/28 03:00 | Jumpei Yamasaki v Kazuki Sugimoto | 7-6,6-3 |
| UTR Pro Yokohama | 2025/01/27 04:00 | Jumpei Yamasaki v Issei Okamura | 6-2,7-5 |
| ITF M15 Bali | 2024/12/25 04:30 | Joshua Charlton v Jumpei Yamasaki | 6-7,6-4,6-1 |
| ITF M15 Bali | 2024/12/24 01:00 | Anthony Susanto v Jumpei Yamasaki | 3-6,0-6 |
| UTR Pro Yokohama | 2025/02/01 06:15 | Issei Okamura v Kotaro Mochizuki | 2-6,4-6 |
| UTR Pro Yokohama | 2025/02/01 00:00 | Issei Okamura v Keisuke Ota | 6-2,7-5 |
| UTR Pro Yokohama | 2025/01/31 01:00 | Issei Okamura v Kazuki Sugimoto | 6-4,6-3 |
| UTR Pro Yokohama | 2025/01/29 03:40 | Issei Okamura v Daiki Sato | 7-5,6-4 |
| UTR Pro Yokohama | 2025/01/28 03:00 | Issei Okamura v Natsuki Yamamoto | 3-6,3-6 |
| UTR Pro Yokohama | 2025/01/27 04:00 | Jumpei Yamasaki v Issei Okamura | 6-2,7-5 |
| ITF M25 Carrara | 2024/11/27 04:35 | Issei Okamura v Thomas Braithwaite | 3-6,1-6 |
| ITF M25 Carrara | 2024/11/26 00:00 | Naoki Tajima v Issei Okamura | 6-4,6-3 |