Billie Jean King made her professional tennis debut ... The problem was, the “tour” wasn’t really a thing yet. King signed with the first dual-gender pro circuit, the National Tennis League.

Along came Billie Jean, just at the moment when a lot of the ... She was the lightning rod in starting a professional women's tour. She started a women's sports magazine and a women's sports ...

Billie Jean King won six Wimbledon singles championships ... She was the lightning rod in starting a professional women's tour. She started a women's sports magazine and a women's sports foundation.