Sergei Bobrovsky had 42 saves.
The 19-year-old Werenski returned to the game, because that's what hockey players do, sporting a full face shield.
Nonetheless, in his first three playoff games, he has two game-winning goals. Goaltender Marc-Andre Fleury - who limited the Blue Jackets to two goals in the first two games - settled down, too.
The Blue Jackets - who won both their home meetings against the Penguins in the regular season - brought their "A" game to start.
Yet Sidney Crosby, like his coach, liked what he was seeing.
In overtime, Fleury made several key stops among his 33 saves, and Guentzel finished off the win, becoming the first rookie in team history with a playoff hat trick.
Columbus isn't the only team in trouble.
The Wild's struggles are even more perplexing.
St. Louis will look to finish off its sweep of Minnesota on Wednesday.
Brady Skjei spoiled Price's shutout bid with 2:56 remaining for his first career playoff goal. Werenski, however, did go to the locker room during overtime because the swelling closed his right eye, so the Blue Jackets were forced to play with five defensemen. We know we're back.
Blue Jackets rookie Zach Werenski took a puck to the face during the second period of Sunday night's game against the Penguins, fell to the ice, got up and left a trail of blood in his wake as he skated toward the bench. He suffered a fractured cheekbone. F Sonny Milano was recalled from Cleveland of the American Hockey League to replace Matt Calvert, who was suspended a game for breaking his stick on Pittsburgh's Tom Kuhnhackl on Friday night.
"Game 4 is always the most hard", he said.
There was "nothing that led to it", he said. "It doesn't mean everything's great, but it built some momentum in the second".
It's been nearly two months since the trade deadline, when we didn't know if Fleury would even be a Penguin this postseason.
Edmonton looks to extend its series lead in Game 4, scheduled for Tuesday. They've done just as bad at stopping the Malkin line, which also racked up 11 points.
The result is that 3-0 lead in the series with a chance to end it here Tuesday night. This is as sublime a goal as you're gonna get. "We have to stay in the moment".
Alexander Radulov's goal Sunday might have been the Montreal Canadiens' last in the road win against the New York Rangers, but it was easily the game's best. He now has two in the playoffs after back-to-back clutch performances. "(Fleury) makes a big save in overtime that probably changed the game". "He's been tremendous for us".
The Penguins answered 3:06 later when Guentzel collected the puck after it bounced off the boards behind the net and beat Bobrovsky on the glove side to tie the score at 1 with his second goal of the series. Cam Atkinson scored in 11 seconds and again on an unassisted goal after Guentzel knotted the score at 1-1.
Artturi Lehkonen and Shea Weber scored power-play goals for Montreal and Carey Price stopped 20 shots. San Jose's quartet of 25-goal scorers in the regular season - Joe Pavelski, Brent Burns, Patrick Marleau and Logan Couture - have none so far in the playoffs. Fleury is in the zone right now, and we know the Penguins will need him to head-off the Jackets in Game 4. He owns one goal in three postseason contests.