In order to stay where I am - and I want to do that - I have to stay dedicated as well as I have been before I became No. 1.

My success has a lot to do with my private life. I've matured a lot by first becoming a husband and now a father. My life is in the right direction. And that helps a player to thrive. One thing is linked with the other. My private life has helped me.

I embraced, I think, the process of becoming No. 1 of the world, which was long and difficult, but it's sweeter in the end.

This time last year I would have said Federer would beat Sampras's record. Now I'm not so sure. His aura has gone. He's not as dominant as he was, and since I beat him in Australia he's looked frustrated. Players are beginning to challenge him now, especially myself and Rafa. He's got 12 Grand Slams to his name and maybe he will beat Sampras, but now I'm here it will be tough for him.

We have a harder way to succeed in life as Serbs because of the past that we had and because of the history we had.

I want to help children in Serbia and around the world so they can realize their dreams.

Honestly, I'm not a big fan of baseball.