Zetterberg's goal 51 seconds into the second period proved to be the game-winner as the Swedes defeated the Czechs 4-2 in the opening game of group play.
Niklas Kronwall picked up an assist on Zetterberg's goal.
Ottawa Senators' defenseman Erik Karlsson scored twice for Sweden, and Rangers' netminder Henrik Lundqvist stopped 27 shots.
Switzerland defeated Latvia 1-0 in the other game today.
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