Conversation so far:
What happened at the early stage of Billie Jean King's career?
Billie Jean King's triumph at the French Open in 1972 made her only the fifth woman in tennis history to win the singles titles at all four Grand Slam events.
How did Billie Jean King's career end?
Billie Jean King retired from competitive play in doubles in March 1990.
Did Billie Jean King win any award or recognition?
Billie Jean King was inducted into the International Tennis Hall of Fame in 1987. The Fed Cup Award of Excellence was bestowed on her in 2010.
Which of Billie Jean King's awards is the most notable?
On August 12, 2009, President Barack Obama awarded King the Presidential Medal of Freedom for her work advocating for the rights of women and the LGBT community.
Which other names were mentioned in the course of Billie Jean King's career?

Question: What was their contribution to the career?
Self-contained rewrite: What was Alice Marble's contribution to Billie Jean King's career?