Factbox on American Serena Williams, who will bid for her 17th grand slam title against Victoria Azarenka at the U.S. Open on Sunday:
* Born in Michigan on Sept. 26, 1981. (Age: 31)
* Turned professional in September 1995.
16 GRAND SLAM SINGLES TITLES
* Australian Open 2003, 2005, 2007, 2009, 2010; French Open 2002, 2013; Wimbledon 2002, 2003, 2009, 2010, 2012; U.S. Open 1999, 2002, 2008; 2012
* Williams is sixth on the list of female grand slam title winners.
* Is one of only five women, after Maureen Connolly, Margaret Court, Martina Navratilova and Steffi Graf, to hold all four grand slam titles at same time. The non-calendar year achievement in 2002-03 was dubbed the 'Serena Slam'. She beat her older sister Venus in each of the four finals.
* She also owns 13 women's grand slam doubles titles with Venus and has won four Olympic gold medals: Singles (2012), doubles (2000, 2008, 2012).
* At the 2009 U.S. Open, Williams was fined $175,000 and placed on a two-year probation for unsportsmanlike behaviour in her semi-final loss to Kim Clijsters.
* She missed the U.S. Open in 2010 because of medical complications after cutting her foot on glass while celebrating her win at Wimbledon.
* In 2011, she underwent surgery after a life-threatening blood clot was detected on her lung. She made the U.S. Open final but lost to Australia's Sam Stosur.
* Last year she became the oldest woman to win U.S. Open since Margaret Court won her last title in 1973, aged 31.