Katarzyna Piter defeated Sandra Martinovic 6-1 6-4 in the Torun 25K round of 16 on clay. The upset overturned the form book — Sandra Martinovic came in leading the head-to-head 1–0. Katarzyna Piter claimed a first win over Sandra Martinovic in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-05-07 | Warsaw 25K | R32 | clay | Sandra Martinovic | 6-3 0-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.