Head to Head includes singles and doubles results.
| 11/16/21 | Eric Cullen over Brian Determan | 6-4; 6-4 | |
| 08/24/21 | Eric Cullen over Brian Determan | 6-1; 6-1 | |
| 06/19/21 | Eric Cullen over Brian Determan | 5-7; 6-4; 6-2 | |
| 05/05/21 | Eric Cullen over Brian Determan | 6-7; 6-3; 7-6 |
