Factbox on American Serena Williams, who plays sister Venus in the final of the Australian Open on Saturday:
Born in Michigan on September 26, 1981. (Age: 35)
GRAND SLAM CAREER
22 wins - Australian Open (2003, 2005,2007, 2009, 2010, 2015); French Open (2002, 2013, 2015);Wimbledon (2002, 2003, 2009, 2010, 2012, 2015, 2016); US Open(1999, 2002, 2008, 2012, 2013, 2014)
* Williams is level with Germany's Steffi Graf with the most grand slam singles titles in the professional era, although Margaret Court has 24.
* One of five women, after Maureen Connolly, Margaret Court, Martina Navratilova and Steffi Graf, to hold all four Grand Slam titles at the same time.
* Williams also owns 14 women's grand slam doubles titles with older sister Venus and has won four Olympic gold medals: singles (2012), doubles (2000, 2008, 2012).
MAKING HER NAME
* Learned to play the game with Venus in Compton, California.
* Both were coached by their father Richard.
* Turned professional in September 1995.
* Won her first WTA Tour title in Paris in 1999, beating Amelie Mauresmo in the final.
* Defeated Martina Hingis in the US Open final in 1999,becoming the first African American woman to win a Grand Slam singles title since Althea Gibson in 1958.
* Failed to make another grand slam final until 2001 when she lost in the US Open final to older sister Venus.
* Missed the 2002 Australian Open with injury then embarked on an incredible run that included winning five of the next six Slams and losing in the semi-finals of the 2003 French Open.
* Career affected by injury over the next four years, winning two Australian Open titles in 2005 and 2007 but failing to advance beyond the quarter-finals at the other three.
* Won the US Open in 2008 to break the Grand Slam drought, having not won a major title since the 2007 Australian Open.
* At the 2009 US Open, Williams was fined $175,000 and placed on a two-year probation for unsportsmanlike behaviour after being defaulted in the semi-final against Kim Clijsters.
* Joined Billie-Jean King on all-time grand slam list in sixth with 12th major title at 2010 Australian Open.
* Missed US Open in 2010 because of medical complications after cutting her foot on glass while celebrating her win at Wimbledon.
* In 2011, underwent surgery after a life-threatening blood clot was detected on her lung. Made the US Open final but lost to Australia's Sam Stosur.
* Won Wimbledon in 2012 and followed that with Olympic gold on the same grass courts, beating top seed Victoria Azarenka in semi-finals and third seed Maria Sharapova in final.
* Won fourth US Open title in 2012, beating Azarenka in the final.
* Won second Roland Garros title in 2013, one of 10 titles she lifted that year to reclaim world's top ranking.
* Claimed seven titles in 2014, including her sixth US Open, which was her third in succession, to join compatriots Chris Evert and Martina Navratilova on 18 Grand Slam wins.
* Defeats Maria Sharapova in the 2015 Australian Open final to secure her 19th Grand Slam title.
* Despite battling a bout of flu, wins a third successivemajor title and 20th overall by overcoming Czech left-hander Lucie Safarova in the French Open final.
* Claimed the so-called 'Serena Slam' by winning sixth Wimbledon crown to hold all four majors for the second time in her career. Seemed poised to secure a calendar Grand Slam at the 2015 US Open but lost to Italy's Roberta Vinci in semi-final.
* Loses the 2016 Australian Open final to Angelique Kerber and is then denied again in the French Open final, this time by Spain's Garbine Muguruza.
* Beats Kerber to win Wimbledon for the seventh time in 2016, drawing level with Steffi Graf on 22 Grand Slam titles.
* Missed the rest of the 2016 season with a shoulder problem after being knocked out of the US Open in the semi-finals by Karolina Pliskova.
* Was year-end number one from 2013-15 but lost the top ranking to Kerber because of her absence from the back end of the 2016 season.
Born June 17, 1980 in Lynwood, California. (Age: 36)
GRAND SLAM CAREER
Seven (Wimbledon 2000, 2001, 2005, 2007, 2008 US Open 2000, 2001)
* Williams also owns 14 women's Grand Slam doubles titles with younger sister Serena.
* Learned to play the game with Serena in Compton, California. Both were coached by their father Richard.
* Turned professional in 1994 at the age of 14 and won her first WTA Tour title in Oklahoma City in 1998.
* In 1997, became the first woman since Pam Shriver in 1978 and first unseeded female since 1958 to reach the US Open final on her debut before losing to Martina Hingis.
* Began a hugely successful doubles Grand Slam career, winning the Australian and French Open mixed doubles with compatriot Justin Gimelstob in 1998 and the French and US Open doubles with sister Serena in 1999.
* Captured her first Grand Slam singles titles in 2000 at Wimbledon and the US Open, also winning the grass court doubles title.
* Won a gold medal at the Sydney Olympics in singles and doubles, with Serena, joining Helen Wills (1924) as the only woman to take both medals in the same Games.
* She has won four Olympic gold medals: singles (2000), doubles (2000, 2008, 2012)
* Repeated her Grand Slam success in 2001, successfully defending her Wimbledon title against Justine Henin and defeating Serena in the US Open final.
* Reached world number one for the first time in her career in February 2002 but then became the first woman to lose five successive grand slam finals from Wimbledon 2002 to Wimbledon 2003. Four of the losses were to Serena.
* Captured her first grand slam title in almost four years, when seeded a lowly 14th she came through to beat Lindsay Davenport 4-6, 7-6(4), 9-7 in the 2005 Wimbledon final.
* Bettered her own record of being the lowest seed ever to win Wimbledon when two years later, seeded 23, she defeated Marion Bartoli to become only the sixth woman to capture four or more Wimbledon titles.
* Won fifth Wimbledon singles title in 2008 with victory over her sister Serena Williams.
* Announced at the 2011 US Open that she was suffering from Sjogrens Syndrome and withdrew from her second round match.
* Dropped out of the top 100 for the first time since 1997 in September 2011.
* Returned to the top 20 in 2014 and was in the top 10 at the end of 2015.
* With 49 WTA singles titles, is second among active players after Serena and 11th in the professional era.
* Is third on the all-time prize money list with $34.4 million, behind Serena ($81.8 million) and Maria Sharapova ($36.5 million)