Ground: Hardcourt outdoor
| ITF M15 Nishi-Tokyo | 2019/03/12 01:00 | Issei Okamura v Hikaru Shiraishi | 6-2,6-3 |
| ITF Japan F6 Qual | 2018/04/08 01:00 | Issei Okamura v Hikaru Shiraishi | 6-4,6-3 |
| ITF M15 Yanagawa | 2024/10/30 00:25 | Issei Okamura v Shunsuke Nakagawa | 5-7,3-6 |
| ITF M15 Tanagura | 2024/10/26 01:00 | Ryotaro Matsumura v Issei Okamura | 6-2,6-2 |
| ITF M15 Tanagura | 2024/10/25 00:30 | Issei Okamura v Yuichiro Inui | 6-4,6-7,6-3 |
| ITF M15 Tanagura | 2024/10/24 00:55 | Issei Okamura v Yusaku Sugaya | 2-6,6-3,7-5 |
| ITF M15 Tanagura | 2024/10/22 00:30 | Chan-Yeong Oh v Issei Okamura | 2-6,4-6 |
| ITF M15 Bali | 2024/09/17 05:10 | Leo Vithoontien v Issei Okamura | 3-6,6-2,7-6 |
| ITF M25 Bali | 2024/09/16 03:30 | Issei Okamura v Jack Bruce-Smith | 6-1,6-3 |
| ITF M25 Bali | 2024/09/15 01:30 | Issei Okamura v Alexey Shtengelov | 6-2,6-2 |
| Challenger Matsuyama | 2024/11/03 01:00 | Hikaru Shiraishi v Philip Sekulic | 3-6,2-6 |
| Challenger Sydney | 2024/11/01 03:20 | Hikaru Shiraishi v Thanasi Kokkinakis | 2-6,1-6 |
| Challenger Sydney | 2024/10/30 00:15 | Marc Polmans v Hikaru Shiraishi | 6-3,1-6,2-6 |
| Challenger Sydney | 2024/10/28 03:25 | Hikaru Shiraishi v Moerani Bouzige | 6-2,6-4 |
| Challenger Playford | 2024/10/22 06:00 | Hikaru Shiraishi v Yuki Mochizuki | 4-6,4-6 |
| ITF M25 Takasaki | 2024/09/19 04:40 | Hyeon Chung v Hikaru Shiraishi | 6-3,6-3 |
| ITF M25 Takasaki | 2024/09/18 03:10 | Kokoro Isomura v Hikaru Shiraishi | 6-7,4-6 |
| ITF M25 Sapporo | 2024/09/10 01:00 | Jacob Brumm v Hikaru Shiraishi | 6-1,6-3 |