Karolina Sprem defeated Tsvetana Pironkova 6-3 6-7 7-5 in the Filderstadt qualifying round on hard. The upset overturned the form book — Tsvetana Pironkova came in leading the head-to-head 4–1. Karolina Sprem narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-04-11 | Barcelona | Q16 | clay | Tsvetana Pironkova | 6-1 6-4 |
| 2010-03-23 | Miami | Q32 | hard | Tsvetana Pironkova | 7-6(3) 6-1 |
| 2009-10-11 | Linz | Q16 | hard | Karolina Sprem | 3-6 6-1 6-4 |
| 2009-01-19 | Australian Open | R128 | hard | Tsvetana Pironkova | 6-0 6-4 |
| 2006-10-02 | Stuttgart | R32 | clay | Tsvetana Pironkova | 6-1 6-4 |
Averages over each player's completed matches in the selected window (73 vs 199). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About