Bobby Brink added two goals and Cam York recorded three assists in the win.
With the loss the Czechs slip to 1-0-2 and remain in fourth place of a crazy Group B in which almost anything is still possible. They have but three goals in as many games.
Spencer Knight earned the shutout for the Americans by stopping 22 shots.
"The Czechs showed against Russia that they have a really good team," Brink said. "It took us a while to cash in today, but if we play like we did today for the rest of the tournament, I think we're going to do really well."
"We tried to prepare for today's game in the same way we prepared for Russia, but it didn't work," said Czech forward Adam Raska. "We need to do better for our last game. We had some chances to score but we didn't, and really there's nothing else to say."
Both teams came into the game under difficult circumstances. The Czechs had the near impossible task of trying to replicate their emotional high during their 2-0 win over Russia two days ago, while the Americans had to take their game up a serious notch after a very easy 11-0 win over Austria.
In the end, the Americans prevailed despite the Czechs’ effective strategy of collapsing five men around their goalie Lukas Parik and blocking every pass and shot possible.
Both teams now get a day off before their final preliminary round games on New Year’s Eve. The Czechs take on Austria in a critical game to begin that day, while the Americans will play Sweden in the final game of 2020, one that might very well decide top spot in the group.
This game began with two very different kinds of energy. The U.S. had territorial advantage for much of the opening period but didn’t create many great chances. When they did, goalie Parik was solid.
The Czechs, on the other hand, continued their strong defensive play while patiently waiting for their offensive chances. They had two or three great opportunities but couldn’t connect, leaving the game scoreless through 20 minutes. Both teams also had a power play but it was the p.k. that dominated in both cases.
The Americans remained patient and aggressive, finally breaking through the Czechs’ group defence with three unanswered goals in the second. They opened the scoring at 5:33 when Brett Berard fired a shot at goal that was blocked. He followed the play in and got his own rebound, but as the puck trickled between Parik’s pads Karel Klikorka swept the puck off the goal line, only to have Brink push it home from the crease.
"We knew they were going to pack it in around their goalie and try to keep us to the outside, so we knew if we were going to penetrate we had to get a couple of guys to the net and hope to get a couple of greasy rebounds," Brink noted.
Eight minutes later, Zegras scored his tournament-leading fourth goal during a four-on-four. Jake Sanderson made a sensational no-look pass to Zegras while Parik overplayed the shot, and Zegras had an easy shot into the open cage.
Then, at 15:56, Brink was at it again from in close. This time he got his stick on the ice and went to the goal, redirecting a hard pass from Matthew Beniers behind Parik.
The U.S. didn't quit, keeping the pressure on as the third began. They were rewarded at 6:03 during a delayed penalty when a loose puck came to Zegras at the faceoff dot. He wired a quick shot over Parik's glove for his fifth of the tournament.
Two minutes later, the Americans got their first of three quick goals on the power play to put the game well out of reach. First, Arthur Kaliyev ripped a shot on the short side past Parik. Then, Cole Caufield scored on a shot off the rush. And, finally, Matthew Boldy scored from in tight.
That ended Panik's night, and now the Czechs can only prepare for Austria with a quarter-finals berth likely on the line.