Stan Wawrinka of Switzerland reacts during his men's final match against Novak Djokovic of Serbia at the French Open tennis tournament at the Roland Garros stadium in Paris

Stan Wawrinka of Switzerland reacts during his men’s final match against Novak Djokovic of Serbia at the French Open tennis tournament at the Roland Garros stadium in Paris, France, June 7, 2015. REUTERS/Gonzalo Fuentes