Serena Jameka Williams (born September 26, 1981) is an American professional tennis player who is ranked No. 1 in women’s singles tennis.
The Women’s Tennis Association (WTA) has ranked her world No. 1 in singles on six separate occasions. She became the world No. 1 for the first time on July 8, 2002, and achieved this ranking for the sixth time on February 18, 2013. Williams has spent 259 weeks overall as the WTA ranked #1 as of September 21, 2015, placing her 4th on the List of WTA number 1 ranked players. She is the reigning champion of the Australian Open, French Open, Wimbledon, WTA Tour Championships and Olympic women’s singles and doubles. Williams is regarded by most commentators, sports writers, and current and former players as the greatest female tennis player of all time.
Williams holds the most major singles, doubles, and mixed doubles titles combined amongst active players, male or female. Her record of 36 major titles puts her fifth on the all-time list and second in the open era with: 21 in singles, 13 in women’s doubles, and two in mixed doubles. She is the most recent player, male or female, to have held all four major singles titles simultaneously (2002–03 and 2014–15), the fifth woman ever to do so and only the third player, male or female, to achieve this record twice after Rod Laver and Steffi Graf. She is also the most recent player, together with her sister Venus Williams, to have held all four Grand Slam women’s doubles titles simultaneously (2009–10).