Raonic says he had "portions of the bone that have been causing the discomfort" removed Wednesday.
2016 Wimbledon finalist Raonic pulls out of US Open →
"You know, you have to do a lot. It's a stiff task," said Raonic, who defeated Federer in the semifinals last year before losing to Murray in the final. "I guess you can know what you have to do. It's a lot harder to do it than just to know it."
Fendrich on Tennis: 1 of Big 4 left at Wimbledon, Federer →