I would have thought play Matosevic & Tomic on day 1. Play Hewitt & Guccione for doubles because they are undefeated! Then Tomic & Hewitt on day three unless Matosevic is in better form then he can play.
I don't know, look at the Australian Open, because Matosevic has not won in these matches, and I would not trust him a place in the Davis Cup at the moment, Ebden more proven. Matosevic broke into the top 50, thanks to a lower tournament series - Challenger.