The field for the PGA Championship is sometimes regarded as the strongest in professional golf, routinely having the highest “strength of field rating” of the year according to the Official World Golf Ranking. A number of qualification criteria are used to determine the field, which includes past PGA champions, recent major winners, top finishers in the 2021 PGA Championship, Ryder Cup players, tournament and leading money winners on the PGA Tour, and twenty PGA club or teaching professionals. The PGA of America also issue invitations to players outside of these criteria, which is generally seen to include the top-100 in the world rankings