Max Pacioretty scored the tiebreaking goal on the power play with 42.6 seconds to play as host Montreal completed a four-game sweep and became the first team to advance to the second round of the Stanley Cup playoffs.

Tuukka Rask turned aside 23 shots for his fourth career postseason shutout as visiting Boston secured a 2-1 lead in its Eastern Conference first-round series.

Martin St. Louis and defenseman Dan Girardi each collected a goal and an assist and Henrik Lundqvist finished with 31 saves as visiting New York seized a 2-1 lead in its Eastern Conference first-round series.

Patrick Marleau scored at 6:20 of overtime as visiting San Jose took a commanding 3-0 lead in its Western Conference first-round series.