I am afraid of a lot of things. A dog. I could be afraid of a dog that's upset, for example. And on the tennis courts, maybe on the outside I look fearless, but on the inside, I'm scared. There's not one player in the world who isn't nervous before matches. Especially important matches.

There are many moments during a match when you are tense, wrestling with yourself. Tennis is a lesson in self-control.

If you want to belong to the best, you need good technique and, perhaps even more importantly, a good eye. If you see the ball sooner, you have more time to think about how and where to return it.

I have lived my whole life with high intensity.

My uncle developed the training philosophy. His idea of good tennis training is basically quite simple: you must try to gain time.

I'm not the best player in the history of tennis. I think I'm amongst the best. That's true. That's enough for me.

Hard courts are very negative for the body. I know the sport is a business and creating these courts is easier than clay or grass, but I am 100 per cent sure it is wrong.