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PARIS, FRANCE - MAY 25: Stanislas Wawrinka of Switzerland plays a backhand during his men's single second round match against Taro Daniel of Japan on day four of the 2016 French Open at Roland Garros on May 25, 2016 in Paris, France. (Photo by Aurelien Meunier/Getty Images)

PARIS, FRANCE - MAY 25:  Stanislas Wawrinka of Switzerland plays a backhand during his men's single second round match against Taro Daniel of Japan on day four of the 2016 French Open at Roland Garros on May 25, 2016 in Paris, France.  (Photo by Aurelien Meunier/Getty Images)