Head to Head includes singles and doubles results.
| 09/11/11 | Won Choi over William Mansfield | 2-6; 7-6; 6-4 | Playoff Match |
| 05/22/11 | Won Choi over William Mansfield | 6-2; 6-3 | |
| 09/19/10 | William Mansfield over Won Choi | 6-2; 3-6; 6-4 | |
| 08/28/10 | Won Choi over William Mansfield | 6-4; 6-4 | |
| 08/15/10 | William Mansfield over Won Choi | 4-6; 6-2; 6-2 | Playoff Match |
