| Win | 1999 | US Open | Hard | 
Women's doubles: 14 (14–0)| Result | Year | Championship | Surface | Partner | Opponents | Score | | Win | 1999 | French Open | Clay | 
Mixed doubles: 4 (2–2)| Result | Year | Championship | Surface | Partner | Opponents | Score | | Loss | 1998 | French Open | Clay | 
Other significant finalsOlympic finalsSingles: 1 (1 gold medal)| Result | Year | Tournament | Surface | Opponent | Score | | Gold | 2012 | London Olympics | Grass | 
Doubles: 3 (3 gold medals)| Result | Year | Tournament | Surface | Partner | Opponents | Score | | Gold | 2000 | Sydney Olympics | Hard | 
Year-end championships finalsSingles: 7 (5 titles, 2 runner-ups)| Result | Year | Championship | Surface | Opponent | Score | | Win | 2001 | WTA Finals, Munich | Carpet | 
Tier I / Premier Mandatory & Premier 5 finalsSingles: 33 finals (23 titles, 10 runner-ups)| Result | Year | Tournament | Surface | Opponent | Score | | Win | [1999 Newsweek Champions Cup and the Evert Cup|] | Indian Wells Open | Hard | dts|1999
Doubles: 2 finals (2 titles)| Result | Year | Tournament | Surface | Partner | Opponents | Score | | Win | 1998 | Zurich Open | Carpet | 
WTA career finalsSingles: 98 (73 titles, 25 runner-ups)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score | | Win | 1–0 | [1999 Open Gaz de France – Singles|] | Open GDF Suez, France | Tier II | Carpet | dts|Mar 1999
Doubles: 25 (23 titles, 2 runner-up)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score | | Win | 1–0 | [1998 IGA Classic – Doubles|] | US National Championships, United States | Tier III | Hard | 
Team competition: 4 (3 titles, 1 runner-up)| Result | Date | Tournament | Surface | Partners | Opponents | Score | | Win | [1999 Fed Cup|] | Fed Cup, United States | Hard |  Current through the 2020 Billie Jean King Cup qualifying round
Singles (14–1)| Edition | Round | Date | Location | Opponent nation | Surface | Opponent player | Result | Score | Team result | | 1999 | WG SF | | Ancona, Italy | dts|Apr 2003
Head-to-head recordsRecord against top 10 playersWilliams's record against players who have been ranked in the top 10. She has recorded wins against 22 of the other 26 women who have been ranked No. 1 in the Open Era, with the other 4 players retiring before her professional career began in 1995. Active players are in boldface.
Record against No. 11–20 playersWilliams's record against players who have been ranked world No. 11–20. Williams has a record against players who were, at the time the match was played, ranked in the top 10.
| Season | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | Total | | Wins | 0 | 0 | 2 | 5 | 14 | 5 | 7 | 17 | 10 | 8 | 3 | 0 | 7 | 9 | 14 | 1 | 5 | 18 | 21 | 12 | 6 | 6 | 1 | 1 | 3 | 0 | 2 | 1 | 178 |
Longest winning streaks33-win major streak 2002–03| Streak no | Tournament | Start date | Surface | Rd | Opponent | Rank | Res | Score | | Last loss | 2001 US Open | August 27, 2001 | Hard | F | 
34-win streak 2013| No. | Match | Tournament | Start date | Category | Surface | Rd | Opponent | Rank | Score | | – | 676 | Qatar Total Open | 11 February | Premier 5 | Hard | F | 
33-win major streak 2014–15| Streak no | Tournament | Start date | Surface | Rd | Opponent | Rank | Res | Score | | Last loss | 2014 Wimbledon | June 23, 2014 | Hard | R3 | 
| Outcome | Year | No. | Championship | Surface | Opponent | Rank | Round | | Quarterfinalist | 1998 | 1. | LA Women's Tennis Championships, USA | Hard | 
Grand Slam tournament seedingsBoldface indicates tournaments won by Williams, while italics indicates she was the runner-up.
Singles| Year | Australian Open | French Open | Wimbledon | US Open | | 1998 | unseeded | unseeded | unseeded | unseeded | | 1999 | unseeded | 10th | did not play | 7th | | 2000 | 3rd | did not play | 8th | 5th | | 2001 | 6th | 6th | 5th | 10th | | 2002 | did not play | 3rd | 2nd | 1st | | 2003 | 1st | 1st | 1st | did not play | | 2004 | did not play | 2nd | 1st | 3rd | | 2005 | 7th | did not play | 4th | 8th | | 2006 | 13th | did not play | did not play | wildcard | | 2007 | Unseeded | 8th | 7th | 8th | | 2008 | 7th | 5th | 6th | 4th | | 2009 | 2nd | 2nd | 2nd | 2nd | | 2010 | 1st | 1st | 1st | did not play | | 2011 | did not play | did not play | 7th | 28th/Protected Ranking | | 2012 | 12th | 5th | 6th | 4th | | 2013 | 3rd | 1st | 1st | 1st | | 2014 | 1st | 1st | 1st | 1st | | 2015 | 1st | 1st | 1st | 1st | | 2016 | 1st | 1st | 1st | 1st | | 2017 | 2nd | did not play | did not play | did not play | | 2018 | did not play | protected ranking | 25th/Protected Ranking | 17th | | 2019 | 16th | 10th | 11th | 8th | | 2020 | 8th | 6th | tournament cancelled | 3rd | | 2021 | 10th | 7th | 6th | did not play | | 2022 | did not play | did not play | wildcard | Protected Ranking |
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