Sara Errani defeated Victoria Azarenka 7-5 6-3 in the Toronto round of 16 on hard. The upset overturned the form book — Victoria Azarenka came in leading the head-to-head 7–1. Sara Errani narrowed the head-to-head to 7–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-10-21 | WTA Championships | RR | hard | Victoria Azarenka | 7-6(4) 6-2 |
| 2013-05-13 | Rome | SF | clay | Victoria Azarenka | 6-0 7-5 |
| 2013-02-11 | Doha | QF | hard | Victoria Azarenka | 6-2 6-2 |
| 2011-05-09 | Rome | R32 | clay | Victoria Azarenka | 6-1 6-2 |
| 2011-04-04 | Marbella | SF | clay | Victoria Azarenka | 6-2 6-1 |
| 2009-01-05 | Brisbane | SF | hard | Victoria Azarenka | 6-3 6-1 |
| 2008-10-06 | Moscow | R32 | hard | Sara Errani | 1-6 6-4 6-3 |
| 2008-04-07 | Amelia Island | R64 | clay | Victoria Azarenka | 3-6 7-5 6-4 |
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 195). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About