It is very dangerous to have your self-worth riding on your results as an athlete.

Sports for me is when a guy walks off the court, and you really can't tell whether he won or lost, when he carries himself with pride either way.

I'm a big proponent of Hawk-Eye. I think it's a wonderful addition, not only for the players, but more importantly for the fans.

The dumber you are on court, the better you're going to play.

I will do everything in my power to make sure people are aware that our team is out there fighting the good fight for the tennis fans of the United States.

The airplane has had a big impact on my life.

If I had to choose one man to play for my life, it would be Nadal.

Us going out there and performing our best. That's how I define success. I'm not going to define it for us by the wins and the losses as much as by the effort and how we handle ourselves.

Hell be lucky to last five or six years on those knees. What it might have to come down to is playing less on hard surfaces and playing more on forgiving surfaces.

The good news is I have time.

Even the poor can be fat in the U.S.

To be successful in reaching goals, the right attitude is to never quit. Confidence is to keep the vision alive, by seeing a victory ahead that is worth fighting for.

I have a to-do list and I have a farm I care for, and things I like to do for fun - going to movies and all that stuff. It's a painfully normal life!

I love comedy; so you want to make them happy, make them laugh.

The strength of a wall is neither greater nor less than the courage of the men who defend it.

Honey, I am the chief of my train. If critics want to hop on board, fantastic. There's plenty of room. The KP train is fun.

Those who rise first are morally superior. It's a universal law.

But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.

Dreamlining is so named because it applies timelines to what most would consider dreams.

Philosophy means liberation from the - routine, soaring above the well known, seeing it in new perspectives, arousing wonder and the wish to fly.

Laughter is the music of life.