NEW HAVEN - Reigning Wimbledon champion Petra Kvitova advanced to the semi-finals of the WTA New Haven hardcourt tournament with a 6-4, 6-1 triumph over Czech compatriot Barbora Zahlavova Strycova. Fourth-ranked Kvitova next will face Australia's Samantha Stosur, who ousted Belgium's Kirsten Flipkens 6-3, 4-6, 6-3 in the final warm-up event for the US Open. 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 and will open her Flushing Meadows fortnight next week against France's Kristina Mladenovic. Slovakia's Magdalena Rybarikova defeated American Alison Riske 7-5, 0-6, 6-4 to book a semi-final berth against Italy's Camila Giorgi, who defeated Spain's Garbine Muguruza 6-4, 6-7 (4/7) 6-2.–AFP