Petra Kvitová

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Simona Halep from Romania returns the ball during a Madrid Open tennis tournament semifinal match against Petra Kvitova from the Czech Republic in Madrid, Spain, Saturday, May 10, 2014. (AP Photo/Andres Kudacki)

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Simona Halep from Romania returns the ball during a Madrid Open tennis tournament semifinal match against Petra Kvitova from the Czech Republic in Madrid, Spain, Saturday, May 10, 2014. (AP Photo/Andres Kudacki)

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Petra Kvitova from the Czech Republic returns the ball during a Madrid Open tennis tournament semifinal match against Simona Halep from Romania in Madrid, Spain, Saturday, May 10, 2014. (AP Photo/Andres Kudacki)

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Simona Halep from Romania falls as she returns the ball during a Madrid Open tennis tournament semifinal match against Petra Kvitova from the Czech Republic in Madrid, Spain, Saturday, May 10, 2014. (AP Photo/Andres Kudacki)

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Elena Baltacha of Britain returns a shot to Petra Kvitova of the Czech Republic during a second round women's singles match at the All England Lawn Tennis Championships at Wimbledon, England, Thursday, June 28, 2012. (AP Photo/Kirsty Wigglesworth)

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Czech Republic's Petra Kvitova after defeating Italy's Roberta Vinci in their Fed Cup semifinal tennis match in Ostrava, Czech Republic, Sunday, April 20, 2014. Kvitova won the match and gave Czech Republic a decisive 3-0 lead. (AP Photo/Petr David Josek)

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Czech Republic's Petra Kvitova, right, celebrates with her teammates Lucie Safarova, center, and Andrea Hlavackova, left, after defeating Italy's Roberta Vinci in their Fed Cup semifinal tennis match in Ostrava, Czech Republic, Sunday, April 20, 2014. Kvitova won the match and gave Czech Republic a decisive 3-0 lead. (AP Photo/Petr David Josek)