The Australian Open

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Agnieszka Radwanska of Poland celebrates after defeating Victoria Azarenka of Belarus during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Rick Rycroft)

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Agnieszka Radwanska of Poland, left, shakes hands with Victoria Azarenka of Belarus at the net after Radwanska won their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Rick Rycroft)

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Roger Federer of Switzerland signs autographs for fans after defeating Andy Murray of Britain in their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Aaron Favila)