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PARIS, FRANCE - MAY 26: Jack Sock of the United States is congratulated on victory at the net by Grigor Dimitrov of Bulgaria after their Men's Singles match on day three of the 2015 French Open at Roland Garros on May 26, 2015 in Paris, France. (Photo by Clive Brunskill/Getty Images)

PARIS, FRANCE - MAY 26:  Jack Sock of the United States is congratulated on victory at the net by Grigor Dimitrov of Bulgaria after their Men's Singles match on day three of the 2015 French Open at Roland Garros on May 26, 2015 in Paris, France.  (Photo by Clive Brunskill/Getty Images)