The Australian Open

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Switzerland's Roger Federer prepares to play a shot with a giant tennis racquet during an exhibition match on Kids Tennis Day ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Eugene Hoshiko)

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Britain's Andy Murray answers a question during a news conference ahead of the Australian Open tennis championship in Melbourne Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Russia's Maria Sharapova smiles during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Russia's Maria Sharapova gestures during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Serena Williams of the United States speaks during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Serena Williams of the United States gestures during a press conference ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)

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Japan's Kei Nishikori kisses the trophy after his win over Tomas Berdych of Czech Republic in their final match of the Kooyong Classic ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 11, 2014. (AP Photo/Aijaz Rahi)

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China's Li Na answers a question during a news conference ahead of the Australian Open tennis championship in Melbourne Australia, Saturday, Jan. 11, 2014. (AP Photo/Aaron Favila)