Only two of these three teams can advance. Italy and Mexico are set to play each other at 7pm ET tomorrow.
Winner advances.
If Mexico wins with 4 or less runs, they both advance. (Maybe as many as 5 in an extra innings situation).
Italy advancing by winning would give them a better seed than by losing.
This creates a situation where Mexico winning with a low score lets them both advance. Going for this intentionally would be cooperation. Going straight for the win is defecting.