Conversation so far:
What happened at the early stage of Billie's career?
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, a "career Grand Slam..
How did her career end?
CANNOTANSWER.
Did she win any award or recognition?
King won a record 20 career titles at Wimbledon - six in singles, 10 in women's doubles, and four in mixed doubles.
Which of her awards is the most notable?
King won 129 singles titles, 78 of which were WTA titles, and her career prize money totaled US$1,966,487.
Which other names were mentioned in the course of her career?
In Federation Cup finals, King was on the winning United States team seven times, in 1963, 1966, 1967, and 1976 through 1979.
What was their contribution to the career?
Her career win-loss record was 52-4.
She won the last 30 matches she played, including 15 straight wins in both singles and doubles.
Are there any other interesting aspects about this article?
In Wightman Cup competition, King's career win-loss record was 22-4, winning her last nine matches.

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