When you retire you want to get as far away as possible from the game for a couple of years.

In tennis, you can make a couple of mistakes and still win. Not in golf. I played three rounds in that Tahoe event, and I was drained. Mentally, not physically.

It's not easy to retire at 31. In one respect I was glad I was done. But after a few years of having fun, I got a little restless. When you're 33, 34, and you don't have a focus, you can get kind of lost. As a man, you feel a little bit unfulfilled.

Andre Agassi was my rival in the '90s, and I think as we got older we sort of transcended the game. He was probably the best player I ever played over my career. There's a list of players that were tough, but Andre, certainly, he was the most unique.

Golfers are forever working on mechanics. My tennis swing hasn't changed in 10 years.

I let my racket do the talking. That's what I am all about, really. I just go out and win tennis matches.