Switzerland's Roger Federer hits a forehand return to Russia's Nikolay Davydenko during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)

Associated Press
Switzerland's Roger Federer hits a forehand return to Russia's Nikolay Davydenko during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)
Switzerland's Roger Federer hits a forehand return to Russia's Nikolay Davydenko during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)
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