World No. 1 ranked tennis player Serena Jameka Williams.

Serena Jameka Williams (born September 26, 1981) is an American former World No. 1 ranked female tennis player who has won eight Grand Slam singles titles and an Olympic gold medal in women's doubles.She is currently the top ranked American female player. She is the last player, male or female, to have held all four Grand Slam singles titles simultaneously. In 2005, Tennis magazine ranked her as the 17th-best player of the preceding forty years. She is the younger sister of another former World No. 1 professional female tennis player, Venus Williams. Serena currently resides at Ballen Isles in Palm Beach Gardens, Florida.

Serena Williams and her sister Venus became stars of women's tennis in the late 1990s. The sisters were African-Americans, then a rarity in pro tennis, and quickly became known for their powerful games and flashy outfits. Like Tiger Woods, Serena and Venus were child prodigies who began playing their chosen game before kindergarten. Serena is a year younger than Venus and (at 5'10") about three inches shorter, but she was the first sister to win a major tournament by claiming the singles title at the 1999 U.S. Open. Serena went on to become the dominant women's tennis player of the early 2000s; in 2002-03 she won the "Serena slam" by holding all four grand slam titles at once: the 2002 French Open, Wimbledon and U.S. Open titles, and the 2003 Australian Open. Her other major titles are Wimbledon in 2003 and the Australian Open in 2005 and 2007.