Klara Koukalova defeated Maria Sanchez Lorenzo 7-6 6-0 in the Portoroz round of 32 on hard. The upset overturned the form book — Maria Sanchez Lorenzo came in leading the head-to-head 2–0. Klara Koukalova claimed a first win over Maria Sanchez Lorenzo in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-03-01 | Acapulco | R32 | hard | Maria Sanchez Lorenzo | 7-5 6-3 |
| 2003-04-14 | Budapest | R16 | clay | Maria Sanchez Lorenzo | 6-3 6-1 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (76 vs 19). ATP, WTA & Challenger.