Billie Jean King (née Moffitt) (born November 22, 1943, in Long Beach, California) is a retired tennis player from the United States. She won 12 Grand Slam singles titles, 16 Grand Slam women's doubles titles, and 11 Grand Slam mixed doubles titles. King has been an outspoken advocate against sexism in sports and society. The tennis match for which the public best remembers her is the "Battle of the Sexes" in 1973, in which she defeated Bobby Riggs, a former Wimbledon men's champion who had been one of the leading male players in the 1930s and 1940s.