These are names of players you have undoubtedly heard of: Roger Federer, Guillermo Coria, Gael Monfils, Richard Gasquet All were great juniors, either Junior no.1s or junior slam winners/Orange Bowl champions or both. They went on to become pros playing at the highest level, top 10/20/ players. Here are some other names: Donald Young, Sergiy Stakhovsky, Timothy Neilly, Martin Klizan. All top juniors who could not translate their results to the pro circuit. What separtates the top juniors who don't repeat their success on the junior circuit on the ATP from those who do?