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PARIS, FRANCE - JUNE 07: Stan Wawrinka of Switzerland plays a forehand during mens singles quarter finals match against Marin Cilic of Croatia on day eleven of the 2017 French Open at Roland Garros on June 7, 2017 in Paris, France. (Photo by Adam Pretty/Getty Images)

PARIS, FRANCE - JUNE 07:  Stan Wawrinka of Switzerland plays a forehand during mens singles quarter finals match against Marin Cilic of Croatia on day eleven of the 2017 French Open at Roland Garros on June 7, 2017 in Paris, France.  (Photo by Adam Pretty/Getty Images)