Stadium: Court 2 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Albury | 2019/02/27 23:30 | Issei Okamura v Alexander Crnokrak | 3-6,2-6 |
| ITF M15 Telavi | 2021/08/03 07:45 | Issei Okamura v Aleksandre Bakshi | 6-7,3-6 |
| ITF M25 Telavi | 2021/07/27 09:05 | Zura Tkemaladze v Issei Okamura | 7-6,6-3 |
| ITF M25 Tulsa | 2021/06/14 18:00 | Axel Nefve v Issei Okamura | 6-3,6-2 |
| ITF M25 Santo Domingo | 2021/06/07 18:00 | Issei Okamura v Gabriel Evans | 2-6,6-4,8-10 |
| ITF M25 Santo Domingo | 2021/06/02 13:25 | Jose Olivares v Issei Okamura | 6-3,6-2 |
| ITF M25 Santo Domingo | 2021/06/01 13:00 | Issei Okamura v Ronan Jachuck | 3-6,7-5,10-7 |
| ITF M15 Sharm El Sheikh | 2021/04/08 07:30 | Nicolas Moreno De Alboran v Issei Okamura | 7-5,6-1 |
| ITF M15 Sharm El Sheikh | 2021/04/07 12:50 | Alexandros Skorilas v Issei Okamura | 5-7,2-6 |
| UTR Pro Tennis Series Carrara | 2021/11/07 00:00 | Akira Santillan v Alexander Crnokrak | 6-1,3-6,6-2 |
| UTR Pro Tennis Series Carrara | 2021/11/06 00:30 | Alexander Crnokrak v Jeremy Jin | 6-4,5-4 |
| UTR Pro Tennis Series Carrara | 2021/11/04 23:00 | Alexander Crnokrak v Sam Oster | 6-1,5-4 |
| UTR Pro Tennis Series Carrara | 2021/11/02 23:00 | Alexander Crnokrak v Will Maher | 6-2,5-1 |
| UTR Pro Tennis Series Carrara | 2021/11/01 23:00 | Alexander Crnokrak v Robert Stirling | 6-1,7-5 |
| UTR Pro Tennis Series Carrara | 2021/10/31 23:00 | Louis Clark v Alexander Crnokrak | 3-6,1-5 |
| UTR Pro Tennis Series Carrara | 2021/10/24 03:00 | Akira Santillan v Alexander Crnokrak | 7-5,5-4 |
| UTR Pro Tennis Series Carrara | 2021/10/23 01:28 | Tai Leonard Sach v Alexander Crnokrak | 7-6,6-7,1-6 |