Petra Kvitova defeated Klara Koukalova 6-0 6-1 in the New Haven semi-final on hard. The upset overturned the form book — Klara Koukalova came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Kvitova P. took it in straight sets.
Kvitova P. and Koukalova K. faced 13 of the same opponents in the last 12 months. Kvitova P. went 11–10 (52%) against them, Koukalova K. 7–10 (41%). Results against comparable opponents are close (4 : 3 better-results split).
Hard: Kvitova P. leads 2–0 · Clay: Koukalova K. leads 2–0
Petra Kvitova beat Klara Koukalova 6-0 6-1. Umpiry, "Petra Kvitova vs Klara Koukalova — New Haven Semi-final", https://umpiry.com/match/2013-08-19/koukalova-vs-kvitova-new-haven-sf?utm_source=cite (as of 19 August 2013).