My grandfather went through a lot in his life.

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.

I never wanted to change countries; it's something that is part of me.

I physically feel very fit. I’m very motivated to keep on playing on a very high level. I’m going to try to use these years in front of me to fight for the number one of the world and fight for the biggest titles.

Mostly the problems when I was down were caused by myself. There were times when I was not responsible enough or decisive enough.

The fact that nobody played tennis in my family and you'd say by chance they make three tennis courts in front of the restaurant that my family owned when I was 4, I think that's a destiny. That's kind of life circumstances that kind of come together for you to become who you want to become.

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