Roger Federer

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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)

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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)

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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)