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. Australian Open organizers implemented the Extreme Heat Policy when the temperature reached 42 celcius suspending matches and closing the roof on the main show courts for matches to continue. (AP Photo/Aaron Favila)

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. Australian Open organizers implemented the Extreme Heat Policy when the temperature reached 42 celcius suspending matches and closing the roof on the main show courts for matches to continue. (AP Photo/Aaron Favila)

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