The Fed Cup captain is prepping the U.S. women's team for a July 9-10 semifinal against Russia

What is the most common mistake beginners make?

I've given 50 million clinics, and I can't tell you how many times people let the ball bounce before getting the racquet back. Then they wonder why they're late all the time. I tell people to pose like someone is taking your picture--exaggerate your position.

Who is your favorite player to watch?

Oh, my God, I am such a Roger Federer fan. I'm like, "Don't call me, Federer is on." You can learn everything...

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