Caroline Wozniacki of Denmark reacts after winning the first set against Christina McHale of the U.S. during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Aaron Favila)

Australian Open Tennis

Caroline Wozniacki of Denmark reacts after winning the first set against Christina McHale of the U.S. during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Aaron Favila)

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