The most important tournaments in the series are the Men's and Women's PSA World Championship.

The top eight players at the end of the calendar year are then eligible to play in the PSA World Tour Finals.

(QE): 2019–20 PSA World Squash Championships Qualifying Event.

The qualified players were: These are the winners of the most relevant 2019–2020 national squash championships.

Following is a list of notable players (winners of a main tour title, and/or part of the PSA Men's World Rankings and Women's World Rankings top 30 for at least one month) who announced their retirement from professional squash, became inactive, or were permanently banned from playing, during the 2019–20 season: