I am very skinny.
Joking around is part of my personality, just who I am.
I want to help children in Serbia and around the world so they can realize their dreams.
It gives me goose bumps and little butterflies in the stomach when I start thinking about the 'golden slam.'
I stopped thinking too much about what could happen and relied on my physical and mental strength to play the right shots at the right time.
It's interesting that I had such a close relationship with my grandfather. Because your parents always judge you: they say, 'You shouldn't do this, you shouldn't do that.' But with your grandparents you have a feeling that you can say anything or you can do anything, and they will support you. That's why you have this kind of connection.
I love being around people who care about me, and I care about them.
The history of our country is cruel. We have to face those issues or, should I say, we had to. Not anymore I hope, because we are going in the right direction, and we are ready to forgive, ready to move on.
My mother is a special story. She went through so much to bring us up, four men at home, especially when our country was going through really difficult times.
Nobody actually played tennis in my family.
I always try to adjust to the situation.
As a kid I was creative.
I always tried to win. I was as competitive as I am today.
Serbian history tells that the family is the most important thing and you have to stick with the family.
I had a unique privilege to have a good start in life and a chance to develop my talents.
I'm a happy man, because I am successful in what I do, of course; but what makes me most happy is I have people around me that I love and who love me back. This, for me, is the most important thing. Nobody likes to be alone.
And when I was saying I want to become number one of the world and I was 7, 8 years old, most of the people were laughing to me. Because you know, it seemed like I have one percent chances to do that. And I've done it.
You have to consistently be successful to be one of the top players in the world, and everything is possible in life.
I want the same thing I've wanted since I was 7 years old. I want to be No. 1.
Imagine a part of the U.S.A., from which the U.S.A. started - where is the cradle of your history? This is Kosovo for Serbia.
People look up to me as somebody who is able to switch the image of our country from negative to positive.
I'm happy, my family's happy, everything is going well.
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.
Tennis is my life, obviously; I need to focus, I need to win. But it's not the only thing. I'm not going to play forever.
In terms of playing ability there is nothing to choose between number one and 100. Instead, it's a question of who believes and who wants it more? Which player is mentally stronger? Which player is going to fight the hardest in the big points? These are the things that determine who is the champion.