Serena Jameka Williams (born September 26, 1981) is an American professional tennis player who is currently ranked World No. 1 in singles and No. 2 in doubles with sister Venus Williams (12/8/10). The Women's Tennis Association has ranked her World No. 1 in singles on five separate occasions. She regained this ranking for the fifth time on November 2, 2009. She became the World No. 1 for the first time on July 8, 2002. On July 3, 2010, she became 6th on the all-time greatest champions list.
Williams is the reigning champion in both singles and women's doubles at the Australian Open, the reigning singles champion at Wimbledon, and in women's doubles at the French Open and the US Open. 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. 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.
Williams has won two Olympic gold medals in women's doubles. Williams has won more career prize money than any other female athlete in history. Williams is the younger sister of former World No. 1 Venus Williams. They have played each other in 23 professional matches since 1998, with Serena winning 13 of these matches as of October 2009. As of July 2009, they have met in eight Grand Slam finals, with Serena winning six times. Between the 2002 French Open and the 2003 Australian Open, they met in all four Grand Slam singles finals, the first time in the open era that the same two players had contested four consecutive Grand Slam finals. The pair have won 12 Grand Slam doubles titles together.
| Tournament Name | Years | Record accomplished | Player tied |
| Hopman Cup | 2003–2008 | Two Hopman Cup Titles won | Dominik Hrbatý Tommy Robredo James Blake Arantxa Sánchez Vicario |
| Australian Open | 2003–2010 | 5 singles titles during the open era | Stands alone[4] |
| Australian Open | 2007 | Unseeded winner of singles title | Chris O'Neil (1978) |
| U.S. Open – Australian Open | 1999–2010 | Winner of Grand Slam singles title in three different decades | Martina Navratilova |
| 1999 French Open – 2010 French Open | 1999–2010 | Highest streak of consecutive initial Grand Slam finals won (doubles) (12) | Venus Williams |
| Grand Slam | 2002 | Won two slams in the same calendar year in straight sets | Billie Jean King Martina Navratilova Steffi Graf Martina Hingis Justine Henin |
| Grand Slam | 2000–present | Won 4 slams in straight sets | Evonne Goolagong |
| Sony Ericsson Open (Key Biscayne) | 2002–2008 | 5 singles titles overall | Steffi Graf |
| 2009 WTA Tour | 2009 | Highest single year earnings at $6,545,586 (2009) | Stands alone |
| 1995–present | Highest prize money career earnings by a female athlete at US$31,151,042 | Stands alone | |
| 2010 Wimbledon | 2010 | Most aces served by a female at a Grand Slam (89) | Stands alone |
