Tyler Preziuso, Mark Rassell and Zach Fischer supplied the rest of the offence for Medicine Hat (3-2-0) who dominated the game by a 31-21 shot clock margin.
Former Pats goalie Jordan Hollett made 19 saves in the Tiger crease.
Wyatt Sloboshan and George King scored for the Pats (2-3-1) while former Tiger Matt Bradley had one assist and was minus-1. Regina star Sam Steel was pointless and minus-2.
Tyler Brown turned away 27 shots for the 2018 Memorial Cup hosts.
(With files from the Canadian Press)