Billie Jean King plays tennis.
Billie Jean King ( née Moffitt ; born November 22 , 1943 ) is an American former World No. 1 professional tennis player . 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 .