The Australian Open

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Roger Federer of Switzerland makes a backhand return 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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Rafael Nadal of Spain reacts after losing a point to Roger Federer of Switzerland during their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014.(AP Photo/Aaron Favila)

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Rafael Nadal of Spain looks at the bandaged blister on his left hand as he plays Roger Federer of Switzerland during their semifinal at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 24, 2014.(AP Photo/Andrew Brownbill)