some people here nag that a pitcher isn't pulled quickly enough, others nag that he's pulled too soon
So you pull a pitcher that doesn't appear to be struggling or tiring after 4 innings and 75 pitches. That leaves 5 innings of relief knowing you have a bullpen that sucks ass. So basically, you're leaving about a 1% chance of winning. I should say 4 innings because it's almost guaranteed they'll be no bottom of the 9th.