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PARIS, FRANCE - MAY 31: Stanislas Wawrinka of Switzerland celebrates victory in his Men's Singles match against Gilles Simon of France on day eight of the 2015 French Open at Roland Garros on May 31, 2015 in Paris, France. (Photo by Clive Mason/Getty Images)

PARIS, FRANCE - MAY 31:  Stanislas Wawrinka of Switzerland celebrates victory in his Men's Singles match against Gilles Simon of France on day eight of the 2015 French Open at Roland Garros on May 31, 2015 in Paris, France.  (Photo by Clive Mason/Getty Images)