Head to Head includes singles and doubles results.
| 10/03/23 | John Sullivan over Robert Chang | 6-4; 6-1 | |
| 09/07/23 | John Sullivan over Robert Chang | 6-4; 6-0 | |
| 07/28/23 | John Sullivan over Robert Chang | 6-2; 6-2 | |
| 06/30/23 | John Sullivan over Robert Chang |
6-1; 3-6; TB 10-7 |
