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PARIS, FRANCE - MAY 23: Stan Wawrinka of Switzerland celebrates his victory during the Men's Singles first round match against Lukas Rosol of Czech Republic on day two of the 2016 French Open at Roland Garros on May 23, 2016 in Paris, France. (Photo by Dennis Grombkowski/Getty Images)

PARIS, FRANCE - MAY 23:  Stan Wawrinka of Switzerland celebrates his victory during the Men's Singles first round match against Lukas Rosol of Czech Republic on day two of the 2016 French Open at Roland Garros on May 23, 2016 in Paris, France.  (Photo by Dennis Grombkowski/Getty Images)