Grigor Dimitrov of Bulgaria plays a return to Spain's Rafael Nadal during their quarter final match of the Monte Carlo Tennis Masters tournament in Monaco, Friday, April 19, 2013. (AP Photo/Lionel Cironneau)

Associated Press
Grigor Dimitrov of Bulgaria plays a return to Spain's Rafael Nadal during their quarter final match of the Monte Carlo Tennis Masters tournament in Monaco, Friday, April 19, 2013. (AP Photo/Lionel Cironneau)
Grigor Dimitrov of Bulgaria plays a return to Spain's Rafael Nadal during their quarter final match of the Monte Carlo Tennis Masters tournament in Monaco, Friday, April 19, 2013. (AP Photo/Lionel Cironneau)
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