Roger Federer of Switzerland changes his shirt in  break in his second round match against Blaz Kavcic of Slovenia at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Rick Rycroft)

Australian Open Tennis

Roger Federer of Switzerland changes his shirt in break in his second round match against Blaz Kavcic of Slovenia at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Rick Rycroft)

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