Caroline Wozniacki of Denmark serves 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/Andrew Brownbill)

Australian Open Tennis

Caroline Wozniacki of Denmark serves 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/Andrew Brownbill)

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