Joanna Sakowicz Kostecka defeated Zsofia Gubacsi 6-4 6-4 in the Warsaw 25K round of 32 on carpet. The upset overturned the form book — Zsofia Gubacsi came in leading the head-to-head 1–0. Joanna Sakowicz Kostecka claimed a first win over Zsofia Gubacsi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-06-02 | Galatina 25K | R32 | clay | Zsofia Gubacsi | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.