Focusing on one thing can be tough, and people with fewer options are more apt to concentrate on what they're doing. There's probably something to hunger.

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.

I am there to play tennis and represent the U.S., but I'm also aware that not everyone's going to be able to think that way.

The airplane has had a big impact on my life.

There used to be a lot more politics in the Olympics, when the Soviet Bloc committed a lot of resources for propaganda purposes.

Tennis is more than just shots. It's about being clutch and beating the people on the other side of the net.

When your four biggest tournaments all operate relatively independently, and the ATP and WTA tour operate independently, and you have Davis Cup and Fed Cup that operate independently, it makes it a tough message.