The WTA rankings are the Women's Tennis Association's (WTA) merit-based system for determining the rankings in women's tennis. The top-ranked player is the player who, over the previous 52 weeks, has garnered the most ranking points on the WTA Tour. Points are awarded based on how far a player advances in tournaments and the category of those tournaments. The WTA has used a computerized system for determining the rankings since November 3, 1975. Since 1975, 28 women have been ranked No. 1 by the WTA, of which 15 have been year-end No. 1. WTA No. 1 ranked singles players The rankings are sourced by the WTA Media Guide and the WTA website (which usually revises its rankings every Sunday night or Monday morning, except when tournament finals are postponed). Weeks at No. 1 Weeks are updated automatically. The source for this through the week of January 2, 2012, is the 2012 WTA Tour Official Guide, page 177. Weeks at No. 1 leaders timeline Year-end No. 1 players Per player Players who became No. 1 without having won a Grand Slam tournament title Weeks at No. 1 by decade Current No. 1 player indicated in italic. 1970s* * — Starting November 1975 1980s 1990s 2000s 2010s 2020s WTA rankings were frozen from March 23, 2020 to August 9, 2020. * Stats are automatically updated on Mondays (UTC). Weeks at No. 1 by country Current No. 1 player indicated in bold. See also World number 1 ranked female tennis players (includes rankings before 1975) ITF World Champions List of WTA number 1 ranked doubles tennis players List of ATP number 1 ranked singles tennis players List of ATP number 1 ranked doubles tennis players Current WTA rankings Top ten ranked female tennis players Top ten ranked female tennis players (1921–1974) List of highest ranked tennis players per country References 1 1