On March 2, 2009, Serena Williams beat her sister Venus in the Billie Jean King Cup final held at Madison Square Garden. It was the first time women had played tennis at the Garden in nine years.ESPN: Serena tops Venus in King Cup final (March 3, 2009)

1. Born: September 26, 1981
2. Raised in California
3. Began playing tennis at the age of four
4. Pro since 1995
5. Olympic gold medalist in 2000 and 2008
6. Resides in Florida
7. Won two ESPY Awards for "Female Athlete of the Year" and "Female Tennis Player of the Year"
8. Works with The Owl Foundation
9. Releasing a memoir in 2009
10. On January 31, 2009, Williams won her fourth Australian Open, defeating Dinara Safina in the final round.The New York Times: Serena Williams Holds Australian Trophy, Again

The Williams sisters represented the United States at the 2008 Summer Olympics in Beijing, China. They defeated the Spanish team in the final match to win their second gold medals. Both also played in the women's singles tournament, each but failed to medal.NBC Olympics: Serena Williams