Former French Open champion picks the greatest tennis player of all time

Roger Federer, Rafael Nadal, and Novak Djokovic have often monopolized the "greatest of all time" debate in tennis. Here's what a former French Open champion and World No. 5 thinks about the greatest player in history.

• Former Wimbledon champion chooses the greatest player between Federer, Nadal and Djokovic
• Rafael Nadal reflects on how Novak Djokovic and Roger Federer shaped his career