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

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