Joonas Korpisalo made 21 saves for his second shutout of the season.

The Sacco era started with a bang when Zadorov rattled Clayton Keller into the corner boards in the first minute. It got not only Keller’s attention but also the attention of the Garden faithful who were itching to erupt at just about anything.

The battle continued as Kastelic and Robert Bortuzzo traded blows at center ice in a quick match, with Kastelic landing a takedown.

It was the continuation of a beef the two had last month in Salt Lake City when Bortuzzo took exception to Kastelic’s big hit on Logan Cooley.

As things settled down and the fans settled into their seats, the Bruins got the first of their three power plays in the first period.

The new first unit, with Georgii Merkulov in for Pavel Zacha and Brad Marchand buzzing down the goal line, moved the puck well, but couldn’t get anything past Karel Vejmelka.

Merkulov looked good with a wrist to the chest and Marchand followed it up with a backhand rebound. When the second unit arrived, Zacha, Morgan Geekie and Zadorov landed testers.

Geekie got nailed for tripping Dylan Guenther in the neutral zone, but Utah couldn’t generate much with the man advantage.

Boston had two more shots on the power play (Jack McBain for Zadorov and Cooley for slashing Lohrei) and showed plenty of life.

David Pastrnak (one-off), Justin Brazeau (wrist from the dot) and Geekie (snapper that Brazeau almost tipped in) had the best opportunities.

When the siren sounded, the Bruins, who preached shot volume this week, led in that category, 15-5, but the game remained scoreless.

Michael Carcone’s blind pass early in the second was picked off by Pastrnak and he went coast-to-coast before being caught by McBain as he reached Vejmelka’s crease.

It was another crisp — but fruitless — power play with the Bruins landing four shots, including a pair of Pastrnak one-timers from his office and a Marchand bid that got past Vejmelka but was swept by Ian Cole.

Charlie Coyle was caught tripping with nine seconds left on the power play, but the Bruins killers were there and kept Utah at bay.

The action heated up in the second half of the second period and it was Boston’s struggling power play that lit the flame.

With Cooley suspended for holding Lindholm, the Bruins quickly went to work.

Pastrnak bombed another shot from the circle and Marchand snapped the rebound and it squirted to Lindholm, who slammed into the loose end just 20 seconds in for a 1-0 lead.

With Garden still swinging from the target, Kastelic swung Bortuzzo again.

Just 14 seconds into the finish, the combatants crossed paths and dropped the gloves for round 2. Kastelic stunned Bortuzzo with a lightning right and landed several more before the two hit the ice, still fluttering at each other.

Kastelic got an extra two for roughing, but Utah couldn’t muster a threat against Korpisalo, who was perfect through two.

Jim McBride can be reached at [email protected]. Follow him @globejimmcbride.