Petra Kvitová

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Venus Williams of the U.S. returns the ball to Petra Kvitova of the Czech Republic during the third day of the WTA Qatar Ladies Open in Doha, Qatar, Wednesday, Feb. 12, 2014. (AP Photo/Osama Faisal))

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Petra Kvitova of the Czech Republic returns the ball to Venus Williams of the U.S. during the third day of the WTA Qatar Ladies Open in Doha, Qatar, Wednesday, Feb. 12, 2014. (AP Photo/Osama Faisal)

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Luksika Kumkhum of Thailand celebrates after defeating Petra Kvitova of the Czech Republic during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Petra Kvitova of the Czech Republic waves to the crowd after losing to Luksika Kumkhum of Thailand in their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Luksika Kumkhum of Thailand celebrates after defeating Petra Kvitova of the Czech Republic during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Luksika Kumkhum of Thailand bows to the crowd as she celebrates after defeating Petra Kvitova of the Czech Republic during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Luksika Kumkhum of Thailand celebrates after defeating Petra Kvitova of the Czech Republic during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Supporters of Luksika Kumkhum of Thailand cheer her on during her first round win over Petra Kvitova of the Czech Republic at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Petra Kvitova of the Czech Republic makes a backhand return to Luksika Kumkhum of Thailand during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Petra Kvitova of the Czech Republic returns to Luksika Kumkhum of Thailand during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Luksika Kumkhum of Thailand makes a backhand return to Petra Kvitova of the Czech Republic during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)

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Luksika Kumkhum of Thailand celebrates a point won over Petra Kvitova of the Czech Republic during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014. (AP Photo/Andrew Brownbill)