Morikawa and Schauffele are at 15 under but there are 13 players within five shots.
Shane Lowry shot the lowest ever round in a major by a European male here at the 106th USPGA Championship on Saturday, but his remarkable afternoon could so easily have been yet more historic.
If you have a smoker at home, then it's time to smart smoking your PB&J sandwiches - particular the peanut butter, whether it's store-bought or homemade.