MONTREAL — Tom Kostopoulos scored 48 seconds into overtime to give the Montreal Canadiens a 4-3 victory over the Philadelphia Flyers on Thursday night in the opening game of their second-round series.

Kostopoulos put his own rebound past Martin Biron shortly after a faceoff in Philadelphia’s zone for his third goal of the playoffs.

Alex Kovalev drew Montreal even with 28.6 seconds remaining in regulation, scoring a power-play goal off a faceoff with goalie Carey Price pulled for an extra attacker.

Joffrey Lupul scored a power-play goal 19 seconds into the third to give the Flyers a 3-2 lead.

R.J. Umberger and Jim Dowd scored in the first to give Philadelphia a 2-0 lead. Andrei Kostitsyn and Kovalev tied it at 2 when they scored in the second for Montreal, which won all four meetings between the two teams during the regular season.

Price stopped 30 shots in the first playoff meeting between the teams in 19 years. Biron also made 30 saves.

Red Wings 4, Avalanche 3

DETROIT — Johan Franzen had two goals and an assist to help Detroit build a three-goal cushion, and the Red Wings held on.

Franzen’s second goal early in the second put Detroit ahead 4-1, but Colorado pulled within a goal by the end of the period.

The Avs pulled Jose Theodore after he gave up four goals on 16 shots, then said they sent him to the team hotel because he was sick. Peter Budaj gave the Avs a chance to come back by stopping all 20 shots he faced.

Detroit’s Chris Osgood made 18 saves.

Paul Stastny scored midway through the first period to give Colorado a 1-0 lead.

Henrik Zetterberg tied the score a minute later, then Franzen factored in the next three goals by assisting on Dan Cleary’s goal and scoring twice for the first time in a playoff game.

John-Michael Liles scored at 5:17 of the second for Colorado, and Milan Hejduk scored late in the period to make it 4-3.