The Australian Open

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Novak Djokovic of Serbia chases down a ball for a return to Lukas Lacko of Slovakia during the first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Eugene Hoshiko)

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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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Kiki Bertens of the Netherlands has her temperature taken by a trainer during her first round match against Ana Ivanovic of Serbia at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 13, 2014.(AP Photo/Rick Rycroft)

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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)