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In a game that saw Team USA earn six power plays before they finally cashed in for a goal, it was with the man advantage that gave the U.S. the final edge in their 5-3 victory over Russia in Cologne, Germany on Tuesday.
With the win, Team USA has clinched the top seed in Group A entering the quarterfinal round.
Eichel earned the secondary assist on Anders Lee's game-winning goal, which broke a 3-3 tie with 7:03 remaining in the third period. Eichel passed across the net through traffic to Johnny Gaudreau, who quickly moved the puck back across to find Lee for the tap-in at the back door.
Brock Nelson scored an empty-net goal to seal the win with 22 seconds remaining.
It was a back-and-forth game throughout, with Team USA erasing three one-goal deficits in the first two periods. That was in due in large part to a strong effort from Russian goalie Andrei Vasilevskiy, who stopped all 16 of the shots he faced in a first period that saw the U.S. earn six power plays.
The sixth power play trickled into the second period, and only 12 seconds remained when Team USA finally cashed in on a goal from Kevin Hayes. Each team scored twice more in the period - Anton Belov's goal was answered by a goal from Dylan Larkin, and Nikita Gusev's second of the night was answered by Hayes' second.
While Eichel has yet to find the back of the net in the tournament, he now has five assists in seven games. The lack of goals hasn't been for a lack of trying; he took four shots against Russia to bring his team-leading total to 30.
Team USA, winner of six straight games, will meet Finland in the quarterfinal round on Thursday.