Stadion: Court 9 Round: 54 Ground: Hardcourt outdoor
| ITF - M25 - Tainan | 2023/08/16 02:00 | Ergi Kirkin v Issei Okamura | 6-0,6-2 |
| ITF - M25 - Herzlia | 2023/08/09 11:25 | Amit Vales v Issei Okamura | 6-4,3-6,6-3 |
| ITF - M25 - Herzlia | 2023/08/08 06:30 | Issei Okamura v Eyal Shyovitz | 6-4,6-3 |
| ITF - M25 - Herzlia | 2023/08/07 06:30 | Issei Okamura v Raz Katz | 6-1,6-1 |
| ITF - M15 - Raanana | 2023/08/01 13:20 | Issei Okamura v Ofek Shimanov | 6-4,3-6,2-6 |
| ITF - M15 - Jakarta | 2023/06/27 05:00 | Koki Matsuda v Issei Okamura | 6-3,7-6 |
| ITF - M25 - Anseong | 2023/06/21 02:00 | Sanhui Shin v Issei Okamura | 6-2,6-3 |
| ITF - M25 - Daegu | 2023/06/05 01:00 | Issei Okamura v Chan-Yeong Oh | 1-6,6-4,7-10 |
| ITF - M15 - Alaminos-Larnaca | 2023/05/10 07:00 | Federico Campana v Shinnosuke Hiramatsu | 6-4,6-2 |
| ITF - M15 - Alaminos-Larnaca | 2023/05/09 07:00 | Pietro Marino v Shinnosuke Hiramatsu | 6-0,6-0 |
| ITF - M15 - Alaminos-Larnaca | 2023/05/01 10:00 | Stephanos Schinas v Shinnosuke Hiramatsu | 6-3,6-7,13-11 |
| ITF - M15 - Alaminos-Larnaca | 2023/04/26 07:00 | Guy Den Ouden v Shinnosuke Hiramatsu | 6-2,6-1 |
| ITF - M15 - Alaminos-Larnaca | 2023/04/25 07:00 | Shinnosuke Hiramatsu v Andrea Pecorella | 6-4,6-2 |
| ITF - M15 - Alaminos-Larnaca | 2023/04/24 07:00 | Shinnosuke Hiramatsu v Roman Ruenger | 6-2,6-0 |
| ITF - M15 - Antalya | 2023/04/16 07:00 | Luciano Emanuel Ambrogi v Shinnosuke Hiramatsu | 6-0,6-0 |
| ITF - M25 - Canberra | 2023/03/21 23:00 | Dayne Kelly v Shinnosuke Hiramatsu | 6-3,7-6 |