One day my dad would say, 'OK, if you want to play tennis I can help you out.' And that's how it started. And I had a goal. I wanted to beat my mom first. And my parents and my brother. And that was the ultimate goal.

I just go out there and fight for every point, and then we see how far I can go.

I believe the best in people. I believe if you need a bathroom break you go to the bathroom. If you need treatment, you get treatment. I don't think any rules should be changed.

I feel like everything is possible.

I have proven people wrong so many times. I was told when I was younger there is no chance I will make the top 100, top 50, top 30. Every time I have proven them wrong. It's kind of nice.

Golf can be tougher than tennis when things go wrong, because you can't explain things by saying that your opponent played better than you. It's a cruel sport in that way.

To be the world No. 1 has always been a dream for me.