Grigor Dimitrov of Bulgaria makes a backhand return to Milos Raonic of Canada during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014. (AP Photo/Andrew Brownbill)

Australian Open Tennis

Grigor Dimitrov of Bulgaria makes a backhand return to Milos Raonic of Canada during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014. (AP Photo/Andrew Brownbill)

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