I think this game will be a prime example of a manager leaving a starting pitcher in too long. Everyone in the stadium knows Pettitte has nothing today, but Girardi won't want to "waste" his bullpen, so he'll leave Pettitte out there, hoping that he can somehow magically turn it around.
The irony of that is that 9 times out of 10 the starter ends up getting shelled, so they have to be taken out of the game early anyway. Instead of yanking him early when it's still a fairly close game, he'll probably get yanked early when it's a blowout.
I could be wrong, but these types of games usually play out that way. We'll see...