Cam Atkinson scored the shootout winner as the United States edged Canada 5-4 Friday to open the world hockey championship.
Atkinson's goal past Darcy Kuemper in the sixth round of the shootout gave the Americans a 2-1 edge in the extra session.
Goaltender Keith Kinkaid clinched the win for the Americans when he stopped Jordan Eberle on Canada's final attempt.
Dylan Larkin scored twice in regulation for the United States, while Anders Lee and Johnny Gaudreau had the Americans' other goals.
Pierre-Luc Dubois, Ryan O'Rielly, Anthony Beauvillier and Colton Parayko scored for Canada, which had a two-minute power play in overtime but couldn't take advantage.
Canada's next game is Sunday against South Korea.