A lot of athletes use sports psychologists.

I've been asked a lot lately if tennis is clean or not. I don't know any more how you judge whether a sport is clean. If one in 100 players is doping, in my eyes that isn't a clean sport.

Boxing, mixed martial arts and tennis are the hardest sports to train for.

Everything in tennis is so neat and nice but boxing has sport down to its essence; it is very pure and I like that.

Tennis is an individual sport, and I am quite a self-conscious person.