Stadium: Court 7 Round: 54 Ground: Hardcourt outdoor
| Challenger Yokohama | 2022/10/30 02:35 | Seiya Nakanishi v Daisuke Sumizawa | 3-6,0-6 |
| ITF - Sapporo M25 | 2022/09/01 02:50 | Rio Noguchi v Seiya Nakanishi | 6-0,6-3 |
| ITF - Aktobe M15 | 2023/03/06 09:40 | Issei Okamura v Mykhailo Mossur | 4-6,6-3,5-10 |
| ITF - Aktobe M15 | 2023/02/28 07:30 | Issei Okamura v Max Batyutenko | 6-7,6-4,7-10 |
| ITF - Aktobe M15 | 2023/02/27 10:55 | Issei Okamura v Alexander Orlov | 6-2,7-6 |
| ITF - Burnie M25 | 2023/02/07 23:00 | Adam Walton v Issei Okamura | 6-3,6-4 |
| ITF - Burnie M25 | 2023/02/06 00:00 | Issei Okamura v Stefan Vujic | 7-6,7-6 |
| ITF - Burnie M25 | 2023/02/05 01:00 | Issei Okamura v Mason Naumovski | 6-1,6-3 |
| Challenger Burnie | 2023/01/29 23:00 | Yusuke Takahashi v Issei Okamura | 6-4,6-2 |
| Challenger Burnie | 2023/01/29 01:35 | Liam Puttergill v Issei Okamura | 1-6,3-6 |