Stadium: Court 3 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Matsuyama | 2019/04/10 07:00 | Jumpei Yamasaki v Issei Okamura | 6-4,5-7,1-6 |
| ITF - Kashiwa M15 | 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 |
| ITF - Hinode M15 | 2024/03/11 01:00 | Jumpei Yamasaki v Seiya Nakanishi | 5-7,6-4,8-10 |
| ITF - Nakhon Si Thammarat M15 | 2024/02/22 03:30 | Nam Hoang Ly v Jumpei Yamasaki | 6-4,6-2 |
| ITF - Nakhon Si Thammarat M15 | 2024/02/21 03:55 | Leo Vithoontien v Jumpei Yamasaki | 5-7,7-6,0-6 |
| ITF - Nakhon Si Thammarat M15 | 2024/02/19 04:15 | Jumpei Yamasaki v Corban Crowther | 7-5,7-6 |
| ITF - Nakhon Si Thammarat M15 - Kwalifikacje | 2024/02/18 07:00 | Jumpei Yamasaki v Anapat Timangkul | 6-2,4-6,10-2 |
| ITF - Nakhon Si Thammarat M15 | 2024/02/12 04:45 | Jumpei Yamasaki v Krittin Koaykul | 4-6,3-6 |
| ITF - Yanagawa M15 | 2023/12/30 01:00 | Duckhee Lee v Jumpei Yamasaki | 6-1,3-6,6-1 |
| ITF - Yanagawa M15 | 2023/12/29 00:50 | Jumpei Yamasaki v Takuya Kumasaka | 6-1,6-4 |
| ITF - Hinode M15 | 2024/03/11 04:30 | Koki Matsuda v Issei Okamura | 6-4,6-3 |
| ITF - Hinode M15 | 2024/03/11 01:00 | Yudai Umeoka v Issei Okamura | 3-6,6-7 |
| ITF - Traralgon M25 | 2024/02/27 01:05 | Jesse Delaney v Issei Okamura | 6-4,6-4 |
| ITF - Traralgon M25 | 2024/02/26 01:30 | Winter Meagher v Issei Okamura | 2-6,2-6 |
| ITF - Traralgon M25 | 2024/02/20 23:00 | Issei Okamura v Matt Hulme | 6-1,3-6,3-6 |
| ITF - Traralgon M25 | 2024/02/20 00:25 | Yuta Kikuchi v Issei Okamura | 1-6,7-5,6-10 |
| ITF - Traralgon M25 | 2024/02/18 23:00 | Cooper Errey v Issei Okamura | 4-6,6-7 |
| ITF - Doha M25 | 2024/01/17 13:05 | Issei Okamura v Ali Habib | 3-6,2-6 |