With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Billie Jean King was a doubles tennis player.
text_B: Billie Jean King -LRB- nee Moffitt ; born November 22 , 1943 -RRB- is an American former World No. 1 professional tennis player .. World No. 1. World number 1 women tennis players. tennis player. tennis player. King won 39 Grand Slam titles  : 12 in singles , 16 in women 's doubles , and 11 in mixed doubles .. Grand Slam. Grand Slam ( tennis ). King won the singles title at the inaugural WTA Tour Championships .. WTA Tour Championships. WTA Tour Championships. King often represented the United States in the Federation Cup and the Wightman Cup .. United States. United States. Federation Cup. Fed Cup. Wightman Cup. Wightman Cup. She was a member of the victorious United States team in seven Federation Cups and nine Wightman Cups .. United States. United States. For three years , King was the United States ' captain in the Federation Cup .. United States. United States. Federation Cup. Fed Cup. King is an advocate for gender equality and has long been a pioneer for equality and social justice .. In 1973 , at age 29 , she won the Battle of the Sexes tennis match against the 55-year-old Bobby Riggs , and was the founder of the Women 's Tennis Association , World TeamTennis -LRB- with former husband Larry King -RRB- , and the Women 's Sports Foundation .. 1973 US Open ( tennis ). Battle of the Sexes. Battle of the Sexes ( tennis ). Bobby Riggs. Bobby Riggs. World TeamTennis. World TeamTennis. Larry King. Larry King ( tennis ). 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 .. International Tennis Hall of Fame. International Tennis Hall of Fame. The Fed Cup Award of Excellence was bestowed on King in 2010 .. In 1972 , King was the joint winner , with John Wooden , of the Sports Illustrated Sportsman of the Year award and was one of the Time Persons of the Year in 1975 .. 1972 Wimbledon Championships. 1975 Wimbledon Championships – Women's Singles. John Wooden. John Wooden. Sports Illustrated. Sports Illustrated. Sportsman of the Year. Sportsman of the Year. Time. Time ( magazine ). King has also received the Presidential Medal of Freedom and the Sunday Times Sportswoman of the Year lifetime achievement award .. Presidential Medal of Freedom. Presidential Medal of Freedom. King was inducted into the National Women 's Hall of Fame in 1990 , and in 2006 , the USTA National Tennis Center in New York City was renamed the USTA Billie Jean King National Tennis Center .. USTA National Tennis Center. USTA National Tennis Center
related.