What is Billie Jean King's net worth? Billie Jean King's net worth is $15 million dollars. Born in Long Beach, California, Billie Jean King made her debut on the professional tennis circuit at age 15 in 1959. She won her first major match in 1960. Though she had been told that she had no future in tennis, she went on to win the US Open in 1964, 1967, 1974, 1978, and 1980; the French Open in 1972; and Wimbledon in 1961, 1962, 1965, 1967, 1968, 1970 through 1973, and again in 1979. In addition to her singles wins, she won doubles titles eleven times. Already a well-known player amongst tennis aficionados, she became a household name when she agreed to play male tennis player Bobby Riggs, a former world #1, who had repeatedly stated that women's sports were inferior to men's sports. The match was called, "The Battle of the Sexes", and the prize was $100,000. Billie Jean King won in straights sets, 6-4, 6-3, 6-3.