She has won an all-time record of 12 Grand Slam singles titles on hardcourt.Williams holds the Open Era record for most titles won at the Australian Open (6) and shares the Open Era record for most titles won at the US Open with Chris Evert (6).She also holds an all-time record for the most singles matches won at the Grand Slams with 309 matches (through 2016 US Open quarter-finals).
As a team, she and Venus have the second most women's doubles grand slam titles, only behind the 20 titles won by Martina Navratilova and Pam Shriver.Williams is also a five-time winner of the WTA Tour Championships in the singles division.While he and subsequently her mother, Oracene, have been the official coaches, other mentors who helped her learn the game included Richard Williams in Compton (not to be confused with her father) who would go on to found The Venus and Serena Williams Tennis/Tutorial Academy.when she was nine so that she could attend the tennis academy of Rick Macci, who would provide additional coaching. The Women's Tennis Association (WTA) has ranked her world No. On that occasion, she held the ranking for 186 consecutive weeks, setting the joint record with Steffi Graf for the most consecutive weeks as world No. Williams is regarded by some commentators, players and sports writers as the greatest female tennis player of all time.
1 for the first time on July 8, 2002, and achieved this ranking for the sixth time on February 18, 2013. 1 for 309 weeks, which ranks her third all time among female tennis players.Williams holds the most major singles, doubles, and mixed doubles titles combined amongst active players, male or female.Her record of 38 major titles puts her fourth on the all-time list and second in the open era: 22 in singles, 14 in women's doubles, and two in mixed doubles.She is the most recent female player to have held all four major singles titles simultaneously (2002––15) and the third player, male or female, to achieve this record twice after Rod Laver and Steffi Graf.She is also the most recent player, together with her sister Venus Williams, to have held all four Grand Slam women's doubles titles simultaneously (2009–10).Her total of 22 Grand Slam singles titles marks the joint record for the most Major wins by a tennis player (male or female) in the Open Era, She is the only tennis player – female or male – to have won singles titles at least six times in three of the four Grand Slam tournaments.