Goaltender Cory Schneider made 47 saves for the Devils.
Blake Coleman added a goal for the Devils, and Will Butcher and Adam Henrique had two assists apiece.
James van Riemsdyk, Dominic Moore and Auston Matthews scored for Toronto, and Maple Leafs goalie Frederik Andersen stopped 25 shots.
Penguins 3, Capitals 2
WASHINGTON -- Patric Hornqvist notched a goal and an assist in his first game of the season, Matt Murray stopped 20 shots, and Pittsburgh defeated Washington.
Kris Letang and Conor Sheary also scored for the Penguins, who converted 3 of 6 power play chances. Hornqvist returned after missing the first three games of the season following a procedure on his right hand in the offseason.
The Capitals' Christian Djoos, making his NHL debut, had a goal and assisted on Alex Ovechkin's eighth goal of the season. Braden Holtby made 33 saves for Washington.
Avalanche 6, Bruins 3
DENVER -- Sven Andrighetto had two goals, Matt Duchene and Nail Yakupov had a goal and an assist each, and Colorado held off Boston's third-period rally.
Semyon Varlamov stopped 20 shots, Tyson Jost and Alexander Kerfoot also scored, and Nathan MacKinnon and Gabriel Landeskog had two assists apiece for Colorado. The Avalanche swept the home-and-home series with the Bruins.
Brad Marchand, Tim Schaller and Torey Krug scored for Boston. Tuukka Rask, who was pulled after the second period, stopped 22 of 26 shots. Backup Anton Khudobin was a perfect 9-for-9 in the third period.
Ducks 3, Islanders 2
ANAHEIM, Calif -- Anaheim failed to score on four power plays, making the Ducks 0-for-15 on the season, but got goals from three different players and 39 saves from John Gibson to snap a two-game losing streak.
The Islanders failed to score on five power plays and are 0-and-15 to open the season. They lost despite finishing with a 41-30 edge in shots.
Andrew Cogliano, Rickard Rakell and Patrick Eaves scored for the Ducks, who took the lead for good at 2-1 in the second period. Brock Nelson had two goals for New York, and Islanders goalie Jaroslav Halak made 27 saves.