Joanna Sakowicz Kostecka defeated Katarina Kachlikova 6-0 6-3 in the Stupava 10K round of 32 on hard. The upset overturned the form book — Katarina Kachlikova came in leading the head-to-head 2–0. Joanna Sakowicz Kostecka claimed a first win over Katarina Kachlikova in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-04-16 | Bari 25K | R32 | clay | Katarina Kachlikova | 7-6(5) 6-3 |
| 2004-11-22 | Opole 25K | R16 | carpet | Katarina Kachlikova | 6-3 6-3 |