Colorado College centers Andreas Vlassopoulos and Chad Rau scored two goals within 25 seconds to give the Tigers a 2-0 lead heading into the final 20 minutes.
CC managed to kill three penalties in the final 10 minutes of the period, thanks to nine saves by goaltender Richard Bachman, who had 15 saves in the frame. Bachman's best sequence came when he made three consecutive saves on shots by Duluth's Michael Gergen and two from Drew Akins.
After left wing Scott McCulloch missed his third breakaway of the game, Bachman preserved the 0-0 tie with a chest save on right wing Justin Fontaine.
A minute later, CC's Jimmy Kilpatrick dug the puck out of the right corner and passed to Vlassopoulos in the right circle. Vlassopoulos' shot beat goaltender Alex Stalock five-hole to give CC the 1-0 lead.
Just 25 seconds later, right wing Mike Testwuide caused Duluth's Josh Meyers to turn over the puck at the blue line. Testwuide skated hard into the offensive zone and made a cross-slot pass to Rau, who finished gloveside on Stalock.
**Addison DeBoer has not returned to the bench after leaving the ice midway through the first period with an unknown injury.