I remember Agassi playing Federer in Basel, Switzerland in 1998, and Andre was already saying at that time that Federer would be tough. Usually at the time players are 17, you can see if they will be great.
You see Boris Becker, Mats Wilander, Nadal, Pete Sampras – they were all great when they were young. As a coach, you can see that type of talent at an early age.