Bulgaria

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Grigor Dimitrov of Bulgaria celebrates his win over 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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Milos Raonic of Canada appeals a point during his third round loss to Grigor Dimitrov of Bulgaria at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Andrew Brownbill)

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Grigor Dimitrov of Bulgaria celebrates his win over 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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Grigor Dimitrov of Bulgaria celebrates his win over 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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Grigor Dimitrov of Bulgaria, right, is congratulated by Milos Raonic of Canada at the net after he won their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2014.(AP Photo/Andrew Brownbill)