Agnieszka Radwanska defeated Sara Errani 6-7 7-5 6-4 in the WTA Championships round robin on hard. The result followed the form book — Agnieszka Radwanska came in leading the head-to-head 3–2, defending last year's round-robin. Agnieszka Radwanska extended the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-04-20 | Stuttgart | R32 | clay | Sara Errani | 7-6(8) 6-4 |
| 2013-08-05 | Toronto | QF | hard | Agnieszka Radwanska | 7-6(1) 7-5 |
| 2013-05-27 | Roland Garros | QF | clay | Sara Errani | 6-4 7-6(6) |
| 2012-05-07 | Madrid | R32 | clay | Agnieszka Radwanska | 6-0 6-1 |
| 2010-06-21 | Wimbledon | R32 | grass | Agnieszka Radwanska | 6-3 6-1 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.