Everyone has to call 'time' at some stage.

Maybe if you're playing in London or America, you don't feel that pressure quite as much.

I'm not a guy who needs to read motivation books.

I was lucky enough to win the Davis Cup in my first year in 1999. I won my first slam at the U.S. Open in 2001 and became world No. 1 later that year. By the age of 20, I'd done it all.

That's what you do all the hard work for, to play in situations that put your body through gruelling times. If you're not up to it, pull out.

I wanted to work towards the four majors and the Davis Cup. I know to a lot of people it may not mean too much, but to me (Davis Cup) means an awful lot.

My video game character is a bit better looking than me, actually. I don't think he has to worry about his hair getting messed up.