Tennis is a psychological sport, you have to keep a clear head. That is why I stopped playing.

How do you build a relationship when you've hardly shared a word but suddenly share a child? How do you love a daughter you don't see for nearly two years? When does she become your daughter? How does she become your daughter?

A few years after my first son was born, he wanted to know how we chose his name, so I began reading him the story of Noah's Ark.

We have a guy from Switzerland who is just playing the game in a way I haven't seen anyone - and I mean anyone - play before. How fortunate we are to be able to see that. If he stays healthy and motivated - and the wonderful feel he has stays with him - he is the kind of guy who can overtake the greatest.

Where do you go when you're the best in the world? What's next?

I don't know how many millions of photographs have been taken of me.

I haven't lost a war. No one got killed. I just lost a tennis match.