Roger Federer of Switzerland serves to Rafael Nadal of Spain during their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014.(AP Photo/Rick Rycroft)

Australian Open Tennis

Roger Federer of Switzerland serves to Rafael Nadal of Spain during their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014.(AP Photo/Rick Rycroft)

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