Boston’s David Pastrnak, left, celebrates his second goal of the game with David Krejci during a 5-1 win Saturday over the Colorado Avalanche at TD Garden. Winslow Townson/Associated Press

BOSTON — David Pastrnak and Trent Frederic scored two goals apiece, Linus Ullmark stopped 25 shots and the Boston Bruins improved to an NHL-record 14-0 at home this season by beating the defending Stanley Cup champion Colorado Avalanche 5-1 on Saturday night.

Jake DeBrusk scored his 100th career NHL goal, making it 5-1 late in the third period, just 10 seconds after Frederic gave the Bruins a 4-1 lead.

Andrew Cogliano scored to make it 3-1 in the third for the injury-plagued Avalanche, spoiling Ullmark’s shutout bid after two Bruins collided in front of the net and gave the puck away. Pavel Francouz made 34 saves for Colorado, which is without forwards Gabriel Landeskog, Valeri Nichushkin, Evan Rodrigues and Darren Helm and defensemen Bowen Byram and Kurtis MacDermid.

Pastrnak gave the Bruins the lead when he one-timed a pass from Brad Marchand into the net on a power play with just under six minutes left in the first period. Charlie McAvoy worked a give-and-go with Pavel Zacha, and Frederic poked in the rebound to make it 2-0 near the end of the first.

Another potential goal, by Jake DeBrusk, was waved off because the net came off its moorings before the puck crossed the line. But Pastrnak made it 3-0 five minutes into the second when he was sprung on a breakaway by David Krejci.

Tomas Nosek had a chance to add to the lead when he was taken down on a breakaway near the end of the period, but Francouz stopped the penalty shot.

NOTES: Avalanche winger Artturi Lehkonen left the game after the first period and did not return. … The Bruins alumni played a charity game against a group of Navy Seals on Saturday afternoon. Among those lacing up for the alumni was the defensive pairing of Ray Bourque and Zdeno Chara.


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