Serena Jameka Williams,born on September 26, 1981 is an American professional tennis player who is a former World No. 1 and currently ranked World No. 25 in singles and No. 20 in doubles with sister Venus Williams.
The Women's Tennis Association has ranked her World No. 1 in singles on five separate occasions. She became the World No. 1 for the first time on July 8, 2002 and regained this ranking for the fifth time on November 2, 2009.