GRAND FORKS, N.D. (AP) - North Dakota scored three times in the first period and held on to beat Colorado College 4-3 to advance in the National Collegiate Hockey Conference playoffs.
Brendan O'Donnell scored what proved to be the game-winning goal early in the third period Sunday.
Alex Roos' goal at 18:31 gave the Tigers a chance.
Nick Mattson, Troy Stecher and Stephane Pattyn scored in the first period for 10th-ranked UND (22-12-3).
Alex Krushelnyski and Michael Morin scored for the Tigers (7-24-6), who forced a third game in the best-of-three series with a 3-2 overtime win Saturday.
Zane Gothberg had 27 saves for North Dakota and Josh Thorimbert stopped 26 shots for the Tigers.
North Dakota took a 3-2 lead into the third period. It improved to 18-1-0 when leaving after two periods.
North Dakota is the only seeded team to avoid an upset in the first round and advance to next weekend's NCHC Frozen Faceoff in Minneapolis.