Anne Schaefer defeated Tanja Ostertag 6-3 6-1 in the Garching 10K round of 32 on clay. The upset overturned the form book — Tanja Ostertag came in leading the head-to-head 1–0. Anne Schaefer claimed a first win over Tanja Ostertag in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-09-05 | Vessy 10K | SF | clay | Tanja Ostertag | 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.