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The mind is everything. What you think, you become.
The more you know yourself, the more patience you have for what you see in others.
The most important thing is to enjoy what you do.
You have to be humble and accept that sometimes you will lose.
The only thing that is under control is your effort.
When you do things with passion, work is not work anymore.
You have to be ready to suffer and enjoy suffering.
"In tennis, like in life, you have to keep moving forward—one point at a time."
"Pressure is a privilege—it means you're in a position to achieve something great."
"You have to believe in yourself when no one else does—that's what makes you a champion."
"When you love what you do, you don't see it as work."
"Tennis is a sport where you have to be strong mentally and physically, but the mental part is even more important."
I told you all I was going to be No. 1, and I did just that.
I work hard, and I do good, and I'm going to enjoy myself. I'm not going to let you restrict me.
No matter how tough the loss, defeat is not final until you stop trying.
"I’m a firm believer in the theory that you only play your best when you’re having fun."
"I always say you can never work too hard."
"You have to put in the hours because there’s always something which you can improve."
"When you do something best in life, you don’t really want to give that up – and for me it’s tennis."
"I always believe if you’re stuck in a hole and maybe things aren’t going well you will come out stronger."