Grigor Dimitrov of Bulgaria returns a shot against Novak Djokovic of Serbia during their match at the BNP Paribas Open tennis tournament, Tuesday, March 12, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

Associated Press
Grigor Dimitrov of Bulgaria returns a shot against Novak Djokovic of Serbia during their match at the BNP Paribas Open tennis tournament, Tuesday, March 12, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Grigor Dimitrov of Bulgaria returns a shot against Novak Djokovic of Serbia during their match at the BNP Paribas Open tennis tournament, Tuesday, March 12, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
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