PARIS, FRANCE - JUNE 02: Stanislas Wawrinka of Switzerland in action during his men's singles quarterfinals match against Roger Federer of Switzerland at Roland Garros on June 2, 2015 in Paris, France. (Photo by Aurelien Meunier/Getty Images)
PARIS, FRANCE - JUNE 02: Stanislas Wawrinka of Switzerland in action during his men's singles quarterfinals match against Roger Federer of Switzerland at Roland Garros on June 2, 2015 in Paris, France. (Photo by Aurelien Meunier/Getty Images)