Carmen Klaschka defeated Tanja Ostertag 6-3 6-3 in the Stuttgart-Vaihingen 25K round of 16 on clay. The upset overturned the form book — Tanja Ostertag came in leading the head-to-head 1–0. Carmen Klaschka claimed a first win over Tanja Ostertag in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-29 | Stuttgart 25K | R32 | clay | Tanja Ostertag | 7-6(2) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.