Head to Head includes singles and doubles results.
| 12/08/21 | Frank Krieger over Michael Mann | 6-3; 6-3 | |
| 11/10/21 | Frank Krieger over Michael Mann | 6-3; 7-6 | |
| 10/04/21 | Michael Mann over Frank Krieger | 7-6; 6-3 | |
| 10/01/21 | Frank Krieger over Michael Mann |
6-3; 6-7; TB 10-8 |
