Billie Jean King was a tennis player.
Billie Jean King ( née Moffitt ; born November 22 , 1943 ) is an American former World No. 1 professional tennis player . King often represented the United States in the Federation Cup and the Wightman Cup . Fed Cup is the premier international team competition in women 's tennis , launched in 1963 to celebrate the 50th Anniversary of the International Tennis Federation ( ITF ) .