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's highest professional level, the PSA World Tour involves over 200 tournaments annually around the world. Over 800 players from all the 5 continents (over 60 different countries represented ) are registered with the PSA and rankings are updated monthly based on players' performances.