Toronto's Auston Matthews made the highest-scoring debut in modern NHL history with four goals but it was not enough to prevent the Maple Leafs losing 5-4 at Ottawa on Thursday as the new NHL season began.
Matthews, the 19-year-old from Scottsdale, Arizona, kept the Maple Leafs in the game but KyIe Turris scored his second goal of the game just 37 seconds into overtime to give the Senators victory.
Bobby Ryan, Erik Karlsson and Derick Brassard also scored for Ottawa.
Blues 5, Blackhawks 2
St. Louis' Vladimir Tarasenko had two goals and an assist to lead the Blues to a 5-2 win at Chicago in a meeting of Central Division rivals.
Kevin Shattenkirk and Paul Stastny each had a power-play goal and two assists for the Blues, who eliminated the Blackhawks in the first round of the playoffs in April.
Richard Panik and Ryan Hartman scored for Chicago, which had six rookies in the starting lineup, including four playing their first NHL game.
Sharks 2, Kings 1
Brent Burns scored the tiebreaking goal early in the third period to give the Sharks a 2-1 win against Los Angeles.
Logan Couture added a power-play goal and an assist in San Jose's first real game since losing the Stanley Cup Final to Pittsburgh exactly four months earlier.
Tyler Toffoli scored a power-play goal in a rough start to the season for the Kings.
Goaltender Jonathan Quick left - after stopping 14 of 15 shots in the first period - with a lower body injury.
Oilers 7, Flames 4
Edmonton marked the first game at Rogers Place in some style by beating Calgary 7-4.
Edmonton led the season opener 3-1 after one period on goals by Patrick Maroon, Tyler Pitlick and Zack Kassian. Alex Chiasson had a first-period score for the Flames.
Troy Brouwer and Michael Frolik scored for Calgary in the second period to tie it 3-3, but then Connor McDavid netted twice in just over two minutes to restore the hosts' two-goal lead.
Jesse Puljujarvi scored for Edmonton in his NHL debut in the third period. Dennis Wideman had the final goal for Calgary, and then Jordan Eberle added an empty-netter.