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?
What was Alice Marble's contribution to Billie Jean King's career?
Alice Marble was Billie Jean King's coach.
Are there any other interesting aspects about Billie Jean King besides her achievements?
Billie Jean King is an advocate for gender equality and has long been a pioneer for equality and social justice.

Question: Did she ever lose to anyone?
Self-contained rewrite: Did Billie Jean King ever lose to anyone?