Billie Jean is a tennis player.
Billie Jean King . King won 39 Grand Slam titles : 12 in singles , 16 in women 's doubles , and 11 in mixed doubles . The Grand Slam tournaments , also called majors , are the four most-important annual tennis events . The WTA Finals ( formerly known as the WTA Tour Championships short : WTA Championships ) , is a professional tennis tournament played annually at the end of the season for the top-ranked players on the Women 's Tennis Association ( WTA ) tour . The Wightman Cup was an annual team tennis competition for women contested from 1923 through 1989 ( except during World War II ) between teams from the United States and Great Britain .