Serena Jameka Williams (born 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. She is considered  to be one of the greatest women's tennis players of all time, despite a  career hampered by numerous injuries.
Her 27 Grand Slam  titles places her ninth on the all-time list: 13 in singles, 12 in  women's doubles, and 2 in mixed doubles. She is the most recent player,  male or female, to have held all four Grand Slam singles titles  simultaneously and only the fifth woman in history to do so. She was  also the first woman to hold all four Grand Slam doubles titles  simultaneously since Martina Hingis did so in 1998 (with sister Venus Williams). Her 13 Grand Slam singles titles is sixth on the all-time list.
 Williams ranks fourth in Grand Slam women's singles titles won during the open era, behind Steffi Graf (22 titles) and Chris Evert and Martina Navratilova (18 titles each).
 She has won more Grand Slam titles in singles, women's doubles, and mixed doubles than any other active female player.
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