Thanks to all who replied. The majority would pull the infield in and I agree.
The reason I put the question out there is because I lost two playoff games (not in the same league), in just this situation. In both instances the next batter up grounded out to SS and 2B respectively with the infield back allowing the tying the run to score. In both games I lost in extra innings. In answer to a couple of posts:
A big inning can happen at anytime, why play scared.
Sim or real life situation, what's the difference, fundamental baseball logic should apply.
Allowing the next batter to hit and then bringing them in, is backwards thinking in my opinion.

Anyway that's my take on it.