Kathrin Woerle defeated Nathalie Vierin 7-6 6-0 in the Sofia 25K round of 32 on clay. The upset overturned the form book — Nathalie Vierin came in leading the head-to-head 2–1, but Kathrin Woerle had been the form player, winning 2 of their last 7 on clay. Kathrin Woerle narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-03-16 | Cairo 25K | F | clay | Kathrin Woerle | 6-2 6-4 |
| 2003-07-21 | Les Contamines 25K | R32 | hard | Nathalie Vierin | 6-1 6-2 |
| 2002-07-22 | Les Contamines 25K | R16 | hard | Nathalie Vierin | 7-5 6-3 |
Averages over each player's completed matches in the selected window (16 vs 11). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About