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.
2010 Billie Jean King Cup The 2010 Billie Jean King Cup was the 2nd edition of this tennis exhibition tournament. Seven-time Grand Slam champion Venus Williams, 2009 French Open Champion Svetlana Kuznetsova, and 2009 US Open Champion Kim Clijsters participated. 2009 Australian Open and Wimbledon Champion Serena Williams had to withdraw from the event due to a leg injury. She was replaced by 2008 French Open Champion Ana Ivanovic. In the first semifinal, Clijsters defeated Ivanovic in a tiebreaker (7–2), despite Ivanovic having match point at 5–4 up. Williams defeated Kuznetsova in the second semifinal, 6–4. Williams defeated Clijsters in the championship match by a score of 6–4 3–6 7–5.