LOS ANGELES -- Patrick Roy extended his NHL record with his 17th playoff shutout, and Alex Tanguay and Milan Hejduk each had a goal and an assist as the Colorado Avalanche beat the Los Angeles Kings 3-0 Wednesday night.
The Avalanche took a 3-1 lead in the best-of-seven Western Conference semifinal series, which returns to Denver for Game 5 on Friday.
Roy, the league's winningest goalie in the regular season and playoffs, stopped 21 shots, including several spectacular saves in the first period when the Kings swarmed the Avalanche net with 10 shots.
Colorado, with captain and leading scorer Joe Sakic out with a shoulder injury, did all its scoring in the second period.
Like a skilled counterpuncher, the Avalanche absorbed Los Angeles' first-period assault, then went on the attack.
Colorado managed only three shots in the first 20 minutes, but Tanguay, left alone just to the right of the crease, scored 3:55 into the second on the Avalanche's sixth shot against Felix Potvin.
Milan Hejduk made it 2-0 on a power play with 3:33 left in the period and Chris Drury scored just 1:46 later.
Efficient with their shots, the Avalanche scored on three of nine against Potvin in the period. They finished with 21 shots against him.
The Kings pulled Potvin for an extra skater with four minutes remaining, but still couldn't avoid the shutout.