Joanna Sakowicz Kostecka defeated Michaela Pastikova 6-3 6-3 in the Opole 25K qualifying round on carpet. The upset overturned the form book — Michaela Pastikova came in leading the head-to-head 2–0. Joanna Sakowicz Kostecka claimed a first win over Michaela Pastikova in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-11-15 | Pruhonice 25K | R16 | hard | Michaela Pastikova | 6-1 6-1 |
| 2003-06-16 | Gorizia 25K | R32 | clay | Michaela Pastikova | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.