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PARIS, FRANCE - MAY 24: Elias Ymer plays a forehand during his Men's Singles match against Lukas Rosol of Czech Republic on day one of the 2015 French Open at Roland Garros on May 24, 2015 in Paris, France. (Photo by Julian Finney/Getty Images)

PARIS, FRANCE - MAY 24:  Elias Ymer plays a forehand during his Men's Singles match against Lukas Rosol of Czech Republic on day one of the 2015 French Open at Roland Garros on May 24, 2015 in Paris, France.  (Photo by Julian Finney/Getty Images)