Caroline Wozniacki of Denmark celebrates a point on her way to winning over 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 celebrates a point on her way to winning over 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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