I'm curious if there's a way I can tell how long an RP can go B4 going rusty. I have seen that most short releivers seem to lose it at 5-6 games, but I have a Middle guy who is still OK at 6....
I'm hoping that I can rest him 1 more day then start him, but if he goes Rusty, that screws me over....
Anybody know if there is a way I can be sure if he's going to make it to the 7th game ?

(I realize I could just pitch him to 1 batter in the first game, but knowledge would be more fun....)