The tennis ball doesn't know how old I am. The ball doesn't know if I'm a man or a woman or if I come from a communist country or not. Sport has always broken down these barriers.

Security used to be an inconvenience sometimes, but now it's a necessity all the time.

Variety is what I would recommend: As variety is the spice of life in food, so it is in exercise. Change it up. But most of all, don't overdo it.

The mark of great sportsmen is not how good they are at their best, but how good they are their worst.

People who are rich want to be richer, but what's the difference? The toys get different, that's all. The rich guys buy a football team, the poor guys buy a football. It's all relative.

I just try to concentrate on concentrating.

Tennis has given me soul.