Premise: Billie Jean King ( née Moffitt ; born November 22 , 1943 ) is an American former World No. 1 professional tennis player . 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 . Regarded by many in the sport as one of the greatest tennis players of all time , King was inducted into the International Tennis Hall of Fame in 1987 .
Hypothesis: Billie Jean King is an American tennis player.
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