I did interviews with tennis greats, like James Blake and John Isner. I also interviewed tennis pros who aren't well - known but who made all the same sacrifices but had just a little spark of a professional career and are now still orbiting the sport, either as a teaching pro or a coach.

A comparison of the average professional baseball salary to the national average salary over the last one hundred years shows that for the first fifty years, 1920-1970, baseball players held a steady multiple of about 3.4 times the national average income.

A tennis racket lurks in my earliest memories like a sick relative who had come to live with us. When I look at my baby pictures, there it is, resting in my crib in the place of a rattle or chew toy.

Dad was a retired hedge fund manager who made enough millions to retire and focus on my game. Before that, he was on the 1984 U.S. Olympic swimming team. No medals. He was accustomed to winning at everything, but no medals in 1984.