Competitive toughness is an acquired skill and not an inherited gift.

Don’t let a first-set victory lead into a second-set slump

Now that I'm losing some, I can see how tough I was -- the killer instinct, the single-mindedness, playing like a machine. Boy, that's what made me a champion.

Relationships are give-and-take, and when you're a tennis player, you're certainly not giving. You have to be self-absorbed. It has to be about you.

I think team sports probably teach you more about giving - about being unselfish and being flexible.

You pay a price for everything in life.

Find something that you're really interested in doing in your life. Pursue it, set goals, and commit yourself to excellence. Do the best you can.