The oldest rivalry in the NHL kicked off the 2014-15 season in wild fashion as the Montreal Canadiens responded to a late Toronto Maple Leafs goal with one of their own for a 4-3 victory.
Czech Tomas Plekanec scored his second goal of the night with 43 seconds left in regulation to restore Montreal's lead less than two minutes after Morgan Rielly tied the game.
Meanwhile, the defending Stanley Cup champion Los Angeles Kings suffered a 4-0 shutout loss to the San Jose Sharks.
Tommy Wingels scored twice for the Sharks while Kings goaltender Jonathan Quick allowed four goals in two periods and was pulled for the start of the third.
In Calgary, the Vancouver Canucks started on the right foot by defeating the Flames 4-2.
The Boston Bruins, who had the NHL's best record last season but lost in the second round of the playoffs, also left it late in their season-opener as Chris Kelly scored with under two minutes to play in a 2-1 win over the Philadelphia Flyers.
Finnish goalie Tuukka Rask, who won the Vezina Trophy as the NHL's top goalie last season, stopped 19 shots in the victory.