Crimson senior winger Jamin Kerner finished the scoring at 8:45 of the final period off assists from senior defenseman Mark Moore and captain Trevor Allman.
Senior goaltender J.R. Prestifilippo made 30 saves for Harvard while sophomore netminder Adam Hauser turned aside 33 Crimson shots.
On the following night, against the Hockey East cellar dweller Minutemen, ECAC's first-place Crimson continued to struggle to put the puck in the net.
Harvard lost a battle of specialty teams as UMass went 3-for-4 on the power play while Harvard was 2-for-8 with the man advantage.
After a scoreless first period, Minuteman sophomore forward Jedd Crumb lit the lamp at 4:37 of the second on the power play and Kris Wallis expanded the lead to 2-0 at 11:45 of the period.
Dominic Moore, one of the few Crimson players to play well both nights, narrowed the score to 2-1 with 4:15 left in the second, but Harvard would draw no closer.
The penalty kill failed again for the Crimson at 5:44 of the third period when sophomore forward Darcy King slipped the puck past junior goaltender Oliver Jonas for the game-winning goal.
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