Tennis players go into a press conference, and almost every one of them is the same. We do very little differently on a day-to-day basis.

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 when you've got to grit your teeth and hang in there and try and find a way to win when you're not playing your best tennis - that's what I can be proud of

I feel like when I'm match tough and match hard and played a lot of matches I got that competitive winning spirit going and I can get on some rolls like I did last year. I won San Jose, Indian Wells and made the semifinals in Miami so it can happen for me.

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.

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.

Oh, I get pretty fired up on the court. I try to play with a lot of emotion, especially when I'm playing in front of a large crowd. I want to go out and do my best, and to do that, I have to play with the most energy possible.