Head to Head includes singles and doubles results.
| 07/31/10 | Quoc-Huan Ta over Richard Kowalczyk | 4-6; 6-2; 6-4 | |
| 08/30/09 | Richard Kowalczyk over Quoc-Huan Ta | 6-1; 6-4 | |
| 07/04/09 | Quoc-Huan Ta over Richard Kowalczyk | 6-4; 4-6; 6-4 | |
| 04/05/09 | Quoc-Huan Ta over Richard Kowalczyk | 6-2; 6-4 |
