The USA gave up the game's first goal but came back with an effort that the Koreans couldn't match, coming away with a dominant 13-1 win. Gaudreau ended the game with three assists in 14:10 of ice time.
The USA's next game comes on Sunday when they take on Norway.
FIRST PERIOD GOALS
Korea - Jin Hui Ahn, assisted by Sangwook Kim and Wonjun Kim - 5:23
USA - Anders Lee, assisted by Dylan Larkin and Johnny Gaudreau - 8:35
USA - Patrick Kane, assisted by Johnny Gaudreau - 12:56
USA - Charlie McAvoy, assisted by Patrick Kane and Johnny Gaudreau - 13:29
USA - Charlie McAvoy, assisted by Chris Kreider and Dylan Larkin - 19:16
SECOND PERIOD GOALS
USA - Derek Ryan, assisted by Alec Martinez - 3:42
USA - Blake Coleman, assisted by Alec Martinez and Colin White - 7:06
USA - Patrick Kane, assisted by Charlie McAvoy - 8:41
USA - Cam Atkinson, assisted by Patrick Kane and Charlie McAvoy - 12:18
THIRD PERIOD GOALS
USA - Tage Thompson, assisted by Sonny Milano and Nick Jensen - 5:06
USA - Cam Atkinson, assisted by Patrick Kane and Charlie McAvoy - 6:11
USA - Neal Pionk, assisted by Will Butcher - 9:09
USA - Derek Ryan, assisted by Alex DeBrincat and Neal Pionk - 11:40
USA - Sonny Milano, assisted by Alex DeBrincat and Tage Thompson - 18:50