Libuse Prusova defeated Joanna Sakowicz Kostecka 6-4 6-4 in the Valasske Mezirici 25K qualifying round on hard. The upset overturned the form book — Joanna Sakowicz Kostecka came in leading the head-to-head 1–0. Libuse Prusova claimed a first win over Joanna Sakowicz Kostecka in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-11-14 | Pruhonice 25K | R16 | hard | Joanna Sakowicz Kostecka | 7-5 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.