The Australian Open

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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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Novak Djokovic of Serbia celebrates after defeating Lukas Lacko of Slovakia in their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014..(AP Photo/Aaron Favila)

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Serena Williams of the United States celebrates after defeating Ashleigh Barty of Australia in their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Aaron Favila)

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Venus Williams of the U.S. makes a backhand return during her first round match against Ekaterina Makarova of Russia 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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Roger Federer of Switzerland waits to receive serve during a practice session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 12, 2014.(AP Photo/Eugene Hoshiko)