Were both Bob Lutz and Billie Jean King professional tennis players?
Billie Jean King Billie Jean King ("née" Moffitt; born November 22, 1943) is an American former World No. 1 professional tennis player. King won 39 Grand Slam titles: 12 in singles, 16 in women's doubles, and 11 in mixed doubles. King won the singles title at the inaugural WTA Tour Championships. King often represented the United States in the Federation Cup and the Wightman Cup. 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.
1973 WCT World Doubles – Doubles This was the first edition of the WCT World Doubles tennis tournament. The eight highest ranking teams qualified for the event. Third seeds, Robert Lutz and Stan Smith won the tournament in straight sets in the final against Tom Okker and Marty Riessen