Roger Federer was the five-time defending champion , but was defeated by Juan Martín del Potro in the final , 3 -- 6 , 7 -- 6 ( 7 -- 5 ) , 4 -- 6 , 7 -- 6 ( 7 -- 4 ) , 6 -- 2 .
Roger Federer was the defending champion , but was defeated by Juan Martín del Potro in the final , 6 -- 3 , 6 -- 7 ( 5 ) , 6 -- 4 , 6 -- 7 ( 4 ) , 2 -- 6 .