Petra Kvitova defeated Caroline Wozniacki 6-4 6-2 in the Istanbul round robin on clay. The upset overturned the form book — Caroline Wozniacki came in leading the head-to-head 3–1. Petra Kvitova narrowed the head-to-head to 3–2.
Kvitova P. took it in straight sets.
Kvitova P. and Wozniacki C. faced 21 of the same opponents in the last 12 months. Kvitova P. went 29–7 (81%) against them, Wozniacki C. 26–10 (72%). Results against comparable opponents are close (7 : 4 better-results split).
Clay: Wozniacki C. leads 2–1 · Hard: Wozniacki C. leads 1–0 · Grass: Kvitova P. leads 1–0
Petra Kvitova beat Caroline Wozniacki 6-4 6-2. Umpiry, "Petra Kvitova vs Caroline Wozniacki — Istanbul Round Robin", https://umpiry.com/match/2011-10-27/kvitova-vs-wozniacki-istanbul-rr?utm_source=cite (as of 27 October 2011).