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.
“My mother has rheumatoid arthritis. I don't want to lose the ability to jump up and walk across the room or move around with the energy I'm used to having. That's far more important to me than a wrinkle or two.”