BOSTON – Mark Kastelic had a goal and an assist, and the Boston Bruins extended their season-opening winning streak to three games with a 3-1 victory against the Buffalo Sabres at TD Garden on Saturday.

Pavel Zacha and Sean Kuraly also scored for the Bruins (3-0-0). Jeremy Swayman made 21 saves.

“The energy in here right now is amazing,” Kastelic said. “It’s truly a great room to come into every day, right from the staff down to the boys. Everybody’s coming to the rink with a smile, hungry to work and get better each and every day. The energy right now, I’ve got no complaints.”

Jason Zucker scored for the Sabres (0-2-0) and Alex Lyon made 28 saves.

“We need to raise our level of compete," Sabres coach Lindy Ruff said. "I thought our compete was terrible. Worst compete and sk

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