Wimbledon champion Kvitova reaches New Haven semis
Petra Kvitova of the Czech Republic returns a shot to Barbora Zhlavova Strycova of the Czech Republic during the Connecticut Open on August 21, 2014 in New Haven - by Elsa
Fourth-ranked Kvitova next will face the winner of a later quarter-final between Australia's Samantha Stosur and Belgium's Kirsten Flipkens in the final warm-up event for the US Open, which begins Monday.
Second seed Kvitova, the 2012 New Haven winner who lost to Simona Halep in last year's final, will be the third seed at the year's last Grand Slam event and will open her Flushing Meadows fortnight next week against France's 73rd-ranked Kristina Mladenovic.
Kvitova, a 24-year-old left-hander, won their first meeting in 2008 at Paris but lost to Mladenovic, 21, last year in Paris.
Slovakia's Magdalena Rybarikova defeated American Alison Riske 7-5, 0-6, 6-4 to book a semi-final berth against the later winner between Italy's Camila Giorgi and Spain's Garbine Muguruza.
Giorgi ousted four-time New Haven champion Caroline Wozniacki, the Danish fourth seed and former world number one, in the second round.