Billie Jean King once that if you want to be the best, you must never let anyone, anyone, know what you really feel. You see, she told me, they can't hurt you if they don't know. Concerning the qualities of a champion tennis player, King said, King's friend Elton John wrote the song “Philadelphia Freedom”, a nod to her World TeamTennis team, for King. Released New Year's Day 1975, became a number 1 hit. Charles M. Schulz, creator of the "Peanuts" comic strip, was an admirer and close friend. Schulz referred to King several times in "Peanuts" and used the comic strip to
Billie Jean King has said, "She's the wisest human being that I've ever met and has vision people can only dream about. Billie Jean King is my mentor and has given me advice about my tennis and my boyfriends. On dealing with my parents and even how to raise children. And she doesn't have any." In 1979, several top players were asked who they would pick to help them recover from a hypothetical deficit of 1–5 (15–40) in the third set of a match on Wimbledon's Centre Court. Martina Navratilova, Rosemary Casals, and Françoise Dürr all picked King. Navratilova said, "I would have