Vincent Trocheck scored a pair of goals as the United States continued to build its lead and just about clinch a spot in the medal round, leading Slovakia 8-2 after 40 minutes.
The Americans had to start the period killing off the final 1:50 of Shayne Gostisbehere's slashing major, and after surviving that, they took advantage of their own man-advantages.
John Gaudreau's second goal of the game at 4:55 made it 6-2 at 4:55, and then Gaudreau set up Trocheck for a power-play goal at 6:16 to make it 7-2.
Trocheck, a Florida Panthers prospect, then scored his second to make it 8-2 at 10:00 of the period. He won a faceoff in the Slovakia end, skated to the net and scored off the return pass from Tyler Biggs.