Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Kashiwa | 2023/04/03 01:00 | Koki Matsuda v Issei Okamura | 1-6,2-6 |
| ITF M15 Nakhon Si Thammarat | 2023/06/07 03:45 | Koki Matsuda v Orel Kimhi | 4-6,3-6 |
| ITF M25 Jakarta | 2023/04/27 03:00 | Koki Matsuda v Digvijay Pratap Singh | 2-6,3-6 |
| ITF M25 Jakarta | 2023/04/26 05:35 | Anthony Susanto v Koki Matsuda | 3-6,4-6 |
| ITF M25 Jakarta | 2023/04/19 02:30 | Yunseok Jang v Koki Matsuda | 7-5,6-2 |
| ITF M25 Jakarta | 2023/04/18 04:10 | Koki Matsuda v Andrew Rogers | 6-7,6-3,10-4 |
| ITF M25 Jakarta | 2023/04/17 07:00 | Koki Matsuda v Gunawan Trismuwantara | 6-1,6-4 |
| ITF M25 Kashiwa | 2023/04/03 01:00 | Koki Matsuda v Issei Okamura | 1-6,2-6 |
| ITF M25 Kashiwa | 2023/04/02 02:30 | Koki Matsuda v Krittin Koaykul | 6-3,6-3 |
| ITF M25 Daegu | 2023/06/05 01:00 | Issei Okamura v Chan-Yeong Oh | 1-6,6-4,7-10 |
| ITF M25 Daegu | 2023/06/04 01:00 | Issei Okamura v Jin Sung Han | 7-5,6-3 |
| ITF M15 Karuizawa | 2023/05/30 03:30 | Issei Okamura v Sanhui Shin | 6-3,2-6,1-6 |
| ITF M25 Nottingham | 2023/05/01 09:00 | Issei Okamura v Ryan James Storrie | 3-6,3-6 |
| ITF M25 Nottingham Qual | 2023/04/30 09:00 | Issei Okamura v Joseph White | 6-0,6-2 |
| ITF M25 Nottingham | 2023/04/25 09:00 | Issei Okamura v George Houghton | 2-6,1-6 |
| ITF M25 Nottingham Qual | 2023/04/24 13:00 | Issei Okamura v Max Benaim | 6-4,6-4 |
| ITF M25 Kashiwa | 2023/04/06 03:40 | Kaito Uesugi v Issei Okamura | 6-1,6-4 |