List of WTA number 1 ranked singles tennis players
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 singles player is the player who, over the previous 52 weeks, has garnered the most ranking points on the WTA Tour.
Source: Wikipedia — List of WTA number 1 ranked singles tennis players (CC BY-SA 4.0)