Russia's Nikolay Davydenko reacts during his second round loss to Switzerland's Roger Federer at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 17, 2013. (AP Photo/Andrew Brownbill)

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