In my case, I can sincerely say that nothing is impossible... When I was saying I want to be No. 1 of the world, and I was seven or eight years old, most of the people were laughing at me because it seems like I have one percent of chances to do that, and I've done it.

It has been the best thing that has ever happened in my life.

Well, I do feel that I carry the responsibility of representing my country wherever I am, and this responsibility came with the success that I had in last couple of years, not just myself but the whole group of tennis players that comes from Serbia. And athletes in general are, in this moment, the biggest ambassadors that our country has.

We only have one life and one body to care of, and we better do it right. You never know what tomorrow may bring and so we better live this life the best we can and be grateful for everything we have.

I always tried to win. I was as competitive as I am today.

Messi is the best player on the planet and he keeps on improving at Barça, now the best team in the world. What Messi does on and off the pitch is an inspiration for children who dream of becoming a footballer.

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