BOSTON — Jake DeBrusk scored two power-play goals 18 seconds apart early in the third after sitting on the bench for much of the opening period, and the Boston Bruins completed a home-and-home sweep of the Buffalo Sabres with a 3-2 victory Sunday night.

David Pastrnak added his NHL-leading 29th goal and Tuukka Rask made 24 saves for the Bruins, who have earned at least one point in each of their last seven games (4-0-3).

Rasmus Ristolainen and Curtis Lazar scored for the Sabres, who have lost 6 of 7. Linus Ullmark stopped 19 shots.

With Johan Larsson in the penalty box serving a double minor for two separate penalties on the same shift – one for tripping and the other for hooking – DeBrusk scored his power-play goals.

On the first, he circled the net and tipped Steven Kampfer’s shot past Ullmark at 2:37. The second came when DeBrusk fired a tough-angle shot from the left wing that hit the goalie’s right pad and popped into the net inside the near post.

Pastrnak double shifted, skating with his regular line – the team’s top one – and on the second in place of DeBrusk for a large portion of the opening period.

Rask made a couple of big stops in the final three minutes.

With an extra skater on due to a delayed penalty, Lazar’s goal sliced it to 3-2 at 5:08 of the period. Lazar also hit the crossbar with just more than seven minutes to play.

Facing each other again after Boston won 3-0 in Buffalo on Friday, the Sabres seemed a bit more energized at the start, holding the Bruins without a shot on goal for more than 11 minutes into the opening period.

But the Bruins took a 1-0 lead when Pastrnak converted on their second shot, firing a wrister past Ullmark after taking a cross-ice pass from Brad Marchand at the end of a two-on-one break 12:39 in.

The Sabres tied it when Ristolainen was credited with a goal at 6:37 of the second. Rask came across and made a pad save on Ristolainen’s wrister from the right circle. The puck trickled between his pads and was in the crease slightly behind him when defenseman Zdeno Chara tried to poke it back under his legs but banked it into the net off one of the goalie’s skates.

The Bruins had three power plays in the second, but hardly generated any quality chances. In fact, on the third one Buffalo had two good chances that Rask turned aside.

NOTES: Bruins defenseman Connor Clifton left the ice in the first period with an upper-body injury and didn’t return. Boston was already without defenseman Torey Krug and Charlie McAvoy. Krug was placed on injured reserve Friday with an upper-body injury and McAvoy is out with an undisclosed injury.