It is very important and my success very much depends on the harmony that I feel in my private life. It is essential for me to be happy in my private life. And if it continues, I am able to continue playing tennis.

I try to enjoy what I do, and every moment of the life that I have is a blessing. What else can you do but to be happy and try to bring that joy to the other people around - especially in the tournaments. Everybody has bad days. I'm not always funny or laughing.

I am grateful to life. And also to the people who have brought me here. Without them, I could not be where I am now.

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.

Nadal's the best player in history on [clay], and he is one of the best-ever players that played this game.

Each year represents new challenges and obstacles. You have to adjust.

I always try to show my human side to my colleagues and to the whole circuit. More than anything because we are all on the same train, it is part of our work.