Caroline Wozniacki of Denmark appeals a point 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 appeals a point 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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