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.

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.

The confidence is there, the game is there, but physically you can't fight nature sometimes. You can't do much about it.

I am fast and very powerful on the court, so this is what matters.

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.

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.

My father believed in me many times more than I believed in myself.