Victoria Azarenka defeated Serena Williams 2-6 6-2 7-6 in the Cincinnati final on hard. The upset overturned the form book — Serena Williams came in leading the head-to-head 12–2, defending last year's quarter-final. Victoria Azarenka narrowed the head-to-head to 12–3.
Azarenka V. came through in three sets.
Azarenka V. and Williams S. faced 18 of the same opponents in the last 12 months. Azarenka V. went 21–2 (91%) against them, Williams S. 25–2 (93%). Results against comparable opponents are close (2 : 1 better-results split).
Hard: Williams S. leads 7–3 · Clay: Williams S. leads 3–0 · Grass: Williams S. leads 2–0
Victoria Azarenka beat Serena Williams 2-6 6-2 7-6(6). Umpiry, "Victoria Azarenka vs Serena Williams — Cincinnati Final", https://umpiry.com/match/2013-08-18/azarenka-vs-williams-cincinnati-f?utm_source=cite (as of 18 August 2013).