By growing up at a center for people with special needs, I learned to always fight hard to achieve what I want. In this regard, I was incredibly lucky.

As a child, I was lucky to have the support of my parents because starting a tennis career is a very expensive adventure.

I was a little bit lost in my head after winning a Grand Slam. You're like: 'So what's the next goal? What do you want now? Where do you want to be? It's not a problem if you lose.'

Stress is part of your career. You have to accept it and deal with it because there is a lot of emotion in tennis.

Spending big money does not mean you win all the silverware.

I was kind of ashamed of my bourgeois family as a teenager, I guess - I had dreadlocks, shopped in thrift stores and pretended I had no money. At that time, I would have spat on a girl who was buying Yves Saint Laurent.

Investing is for wealth preservation, not wealth creation, so first you have to make wealth.

When I was a kid I got so much help from the Church. When I was a kid, our family was so poor they couldn't afford me to go to school, so there was an American family that send the money to the church to support my school fees.