Billie Jean King (
née Moffitt; born November 22, 1943) is an American former
World No. 1 professional
tennis player. King won 39
Grand Slam titles, including 12 singles, 16 women's doubles, and 11 mixed doubles titles. King won the singles title at the inaugural
WTA Tour Championships. King often represented the United States in the
Federation Cup and the
Wightman Cup. She was a member of the victorious United States team in seven Federation Cups and nine Wightman Cups. For three years, King was the United States' captain in the Federation Cup.