Polona Hercog defeated Nadia Petrova 6-1 6-2 in the Charleston quarter-final on clay. The upset overturned the form book — Nadia Petrova came in defending last year's round of 16. Polona Hercog extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-08-29 | US Open | R64 | hard | Nadia Petrova | 6-2 6-4 |
| 2011-08-22 | New Haven | R32 | hard | Polona Hercog | 7-5 7-5 |
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 (200 vs 79). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About