PARIS, FRANCE - JUNE 02: Stanislas Wawrinka of Switzerland reacts 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 reacts 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)