Caroline Wozniacki of Denmark serves during her second round match against  Christina McHale of the U.S.at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Eugene Hoshiko)

Australian Open Tennis

Caroline Wozniacki of Denmark serves during her second round match against Christina McHale of the U.S.at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2014.(AP Photo/Eugene Hoshiko)

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