The Australian Open

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Japan's Kei Nishikori holds the trophy after win over Tomas Berdych of the 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/Joshua Baker)

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Spain's Rafael Nadal reacts 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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Rafael Nadal of Spain 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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Victoria Azarenka of Belarus plays a shot as she holds hands with Switzerland's Roger Federer 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)