Roger Federer

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Roger Federer of Switzerland throws a towel as he plays Andy Murray of Britain during 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, right, is congratulated by Andy Murray of Britain at the net after Federer won their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Andrew Brownbill)

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Andy Murray of Britain reacts after losing a point to Roger Federer of Switzerland during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Eugene Hoshiko)

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Andy Murray of Britain reacts after losing a point to Roger Federer of Switzerland during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.(AP Photo/Rick Rycroft)

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Andy Murray of Britain speaks during a press conference after his quarterfinal loss to Roger Federer of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014. (AP Photo/Aijaz Rahi)