The Professional Squash Association (PSA) is the governing body for the men's and women's professional squash circuit. The body operates in a similar fashion to the ATP and the WTA for tennis. The PSA World Tour involves over 200 tournaments annually all over the globe. Over 750 players are registered with the PSA and rankings are updated monthly based on players' performances. In November 2014, the WSA and the PSA announced an historic merge between the two associations.