Sorana Cirstea defeated Caroline Wozniacki 5-7 7-6 6-4 in the Toronto round of 32 on hard. The upset overturned the form book — Caroline Wozniacki came in leading the head-to-head 5–2. Sorana Cirstea narrowed the head-to-head to 5–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-03-20 | Miami | R32 | hard | Caroline Wozniacki | 6-4 6-2 |
| 2014-02-17 | Dubai | QF | hard | Caroline Wozniacki | 6-1 6-2 |
| 2013-02-11 | Doha | R32 | hard | Caroline Wozniacki | 7-6 6-0 |
| 2009-08-31 | US Open | R32 | hard | Caroline Wozniacki | 6-3 6-2 |
| 2009-08-03 | Los Angeles | R32 | hard | Sorana Cirstea | 1-6 6-4 7-6 |
| 2009-05-25 | Roland Garros | R32 | clay | Sorana Cirstea | 7-6 7-5 |
| 2006-10-23 | Istanbul 25K | SF | hard | Caroline Wozniacki | 6-2 6-0 |
Averages over each player's completed matches in the selected window (200 vs 199). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Cirstea S.: 2 days rest · 3 matches, 77 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About