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 never know, I might get back into coaching someday.

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.

Sometimes when you're in the storm, it's harder and maybe when it's over, then you can look back on it.

I did a really good job of sticking to the tennis court.

At 21, there's lots more room there, plenty of things to improve on as you get older.

There's always a learning curve, where you've got to learn what your subject is all about.