Phil Kessel scored two of his three goals in the opening 4:33, becoming the first US player with an Olympic hat-trick in more than a decade and leading the Americans to a 5-1 win over Slovenia.
The US (3-0) on Sunday earned an automatic spot in the quarter-finals.
Kessel scored 1:04 after the puck dropped, showing that the Americans didn't have a hangover after their emotionally charged shootout win over Russia on Saturday.
His third goal midway through the second period made him the first US player to have a hat-trick at the Olympics since John LeClair did it on February 15, 2002, against Finland.
Ryan Miller was 17.6 seconds away from a shutout, but Marcel Rodman scored. Miller made 17 saves in his Sochi Games debut.