Mary Pierce defeated Kim Clijsters 6-1 4-6 7-6 in the WTA Tour Championships round robin on carpet. The upset overturned the form book — Kim Clijsters came in leading the head-to-head 3–0. Mary Pierce claimed a first win over Kim Clijsters in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-08-29 | US Open | F | hard | Kim Clijsters | 6-3 6-1 |
| 2004-02-09 | Paris | F | carpet | Kim Clijsters | 6-2 6-1 |
| 2003-10-06 | Filderstadt | SF | hard | Kim Clijsters | 7-6(2) 6-0 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.