Head to Head includes singles and doubles results.
| 06/17/21 | Eray Erdogan over David Koller | 6-4; 6-3 | |
| 01/30/20 | Eray Erdogan over David Koller | 10-2 | |
| 07/11/19 | Eray Erdogan over David Koller | 6-3; 6-0 | |
| 07/04/19 | Eray Erdogan over David Koller | 6-1; 4-6; 7-5 | |
| 09/05/17 | David Koller over Eray Erdogan | 6-1; 6-4 |
