Actually I've come searching on the forum to address this very problem. There are three players I see regularly playing the Master level Ready go's with 61 averages and shooting very low 60's or high 50's in almost every game.
One of them managed a 56 on St Andrews Master RG 18 hole this week.
How can a player remain at Master level with a 61 average? I thought you made Tour Master at circa 63 average?