Obsession is a negative word, I do not think that obsession can bring positive things. Not only in tennis but, I mean in any situation of life.

I don't think, that you can always - you can ever - get your game to perfection, you know. Only if you're Federer.

My priority, the most important thing in my life is my family, my wife and my son.

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 gives me goose bumps and little butterflies in the stomach when I start thinking about the 'golden slam.'

I have always valued the care for my body, and my mind and had holistic approach to life. I always thought this is utmost importance for my tennis.

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.