Tennis is mostly mental. Of course, you must have a lot of physical skill, but you can't play tennis well and not be a good thinker. You win or lose the match before you even go out there.

Life is challenging but I'm always up for a challenge.

For years I felt that I didn't have enough stamina and then, four years ago, I felt like I was not getting enough air but I was diagnosed with exercise-induced asthma. The medicine for asthma never worked.

Nerves are normal. You can't be cured from them unless you're a machine.

You can never get complacent because a loss is always around the corner.

My ambition is to enjoy my life and to do exactly what I want to do. And I'll do that. I will be free.

We're all conditioned that we shouldn't like our brothers and sisters, that we should be angry and fight. But that's abnormal. A lot of people think that the way Serena and I are with one another is weird. It's not.