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.
It is inevitable that those to whom is vouchsafed a long life of usefulness should outlive the friends of their youth.
And I love kick boxing. It's a lot of fun. It gives you a lot of confidence when you can kick somebody in the head.