BOSTON (AP) _ Defenseman Ray Bourque scored two goals and rookie Kraig Nienhuis one on a power play Sunday night as the unbeaten Boston Bruins skated to a 7-2 National Hockey League victory over the Canadiens.

With Boston ahead 2-1, Montreal's Chris Nilan was given a 10-minute match penalty for deliberately causing an injury at 10:40 in the second period when he hit Boston captain Rick Middleton.

While Middleton went off to receive a couple of stitches for a cut in his mouth, the Canadiens were forced to play short handed for 10 minutes. The Bruins nailed down their third victory and handed Montreal its first loss as Bourque scored on a 55-foot shot from the point at 11:40 and Nienhuis scored his first NHL goal at 13:53.

With seconds left on the penalty at the start of the third period, Bourque took a dropped pass from Ken Linseman and scored again to put Boston ahead 5-1.

The two teams then swapped power-play goals, Mats Naslund connecting for Montreal at 10:03 and Middleton for Boston at 13:21 before Louis Sleigher completed the scoring for the Bruins with just over a minute to play.

Boston took a 1-0 lead when Barry Pederson intercepted a Montreal pass and scored unassisted at 15:38 of the first period.

Montreal pulled into a 1-1 tie in the opening minute of the second period when Mike McPhee picked up a rebound and scored his first goal of the season.

Sleigher then put Boston in front to stay, jumping on a faceoff won by Steve Kasper and connecting on a 50-foot screen shot.

Niland faces an automatic suspension, the length of which will be decided after an investigation by the league president's office.