What is the name of the American, two-time defending, professional tennis player who is regarded by some as the greatest female tennis player of all time?
2004 Wimbledon Championships – Women's Singles: Serena Williams was the two-time defending champion, but she was defeated by 17-year-old Maria Sharapova in the final, 6–1, 6–4. Serena Williams:  Some commentators, players and sports writers regard her as the greatest female tennis player of all time.
i don't know