Switzerland's Roger Federer hits a backhand return to Canada's Milos Raonic during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Andrew Brownbill)

Associated Press
Switzerland's Roger Federer hits a backhand return to Canada's Milos Raonic during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Andrew Brownbill)
Switzerland's Roger Federer hits a backhand return to Canada's Milos Raonic during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 21, 2013. (AP Photo/Andrew Brownbill)
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