Head to Head includes singles and doubles results.
| 08/14/21 | Donovan Green over Alexander Kostal | 7-5; 2-6; 7-5 | |
| 05/01/21 | Donovan Green over Alexander Kostal | 6-2; 6-4 | |
| 10/10/20 | Donovan Green over Alexander Kostal | 2-6; 6-3; 6-3 | |
| 08/25/20 | Alexander Kostal over Donovan Green | 6-4; 2-6; 7-5 |
