Boston Bruins right wing David Pastrnak (88) and center Patrice Bergeron (37) celebrate their victory over the New York Islanders in Game 1 of an NHL hockey second-round playoff series, Saturday, May 29, 2021, in Boston. (AP Photo/Elise Amendola)

David Pastrnak got his second career playoff hat trick, David Krejci had four assists and the Boston Bruins beat the New York Islanders 5-2 on Saturday night in the opening game of their second-round playoff series.

Charlie McAvoy and Taylor Hall also scored, and Patrice Bergeron had a pair of assists for the Bruins, who will host Game 2 on Monday night.

Tuukka Rask finished with 20 saves as the Bruins kept most of the action at the other end of the ice, outshooting the Islanders 40-22.

Rask didn’t allow anything past him after Adam Pelech’s goal for the Islanders 12:34 into the second period tied it at 2. It was one of only four shots in the period for the Islanders, who were playing before a rowdy crowd of fans who packed TD Garden for the first time in more than a year.

Anthony Beauvillier also scored for the Islanders, Jordan Eberle had two assists and Ilya Sorokin finished with 35 saves, keeping New York in it through the first 40 minutes despite the onslaught of shots from the Bruins.

Sorokin stopped Pastrnak twice on one-timers from in close in the first period, but couldn’t hold off the Bruins’ sharp-shooter as he got his second career playoff hat trick.

Pastrnak, whose first postseason hat trick came three years ago in Game 2 of the opening round against Toronto, scored his third Saturday after weaving through the Islanders zone and ripping a wrist shot past Sorokin 14:10 into the third period.

The hats began flying from all levels of of the arena, which got loud enough to shake over the few minutes it took to clear the ice as elated Boston fans celebrated being back inside the arena and another victory by the Bruins.

Pastrnak’s goal and an empty-netter by Hall in the final minute triggered several anti-New York chants and a few rounds of “We Want The Cup!”

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