Caroline Wozniacki of Denmark hits a backhand return to 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/Eugene Hoshiko)

Australian Open Tennis

Caroline Wozniacki of Denmark hits a backhand return to 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/Eugene Hoshiko)

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