Brayden Schenn scored on a breakaway 15:06 into overtime and the St. Louis Blues defeated the Vancouver Canucks 3-2 in Game 3 of the Western Conference First Round at Rogers Place in Edmonton on Sunday.
"I jumped on, kind of on the backcheck," Schenn said. "The puck squeaked out to me. Lucky bounce, kind of popped right in the middle there and [Canucks goalie Jacob] Markstrom was playing well, just trying to beat him with a quick shot."
Justin Faulk and David Perron scored for St. Louis, the No. 4 seed in the West, which won its first game in the best-of-7 series. Jake Allen made 39 saves in his first Stanley Cup Playoff start since May 7, 2017.
Game 4 will be in Edmonton, the Western hub city, on Monday (10:30 p.m. ET; NBCSN, CBC, SN, FS-MW).
J.T. Miller and Elias Pettersson scored, and Markstrom made 46 saves for Vancouver, the No. 5 seed in the West which had won five straight postseason games.
"I mean, we knew they were going to push again today and anything can happen in overtime," Canucks captain Bo Horvat said. "We had our looks, they had theirs, and it was just a fortunate play for them. They just kind of slung it and he ended up on a breakaway."
[WATCH: All Blues vs. Canucks Game 3 highlights]
Perron gave the Blues their first lead of the series by scoring from the left circle off a pass from Ryan O'Reilly to make it 2-1 at 18:02 of the second period.
That lead lasted 37 seconds, until Pettersson tied the game 2-2 at 18:39, skating around diving defenseman Colton Parayko after Parayko and partner Marco Scandella misplayed the puck.
Miller scored a power-play goal at 1:19 of the second for a 1-0 lead. Quinn Hughes had an assist to extend his point streak to six games (one goal, eight assists), tying the NHL record for a postseason point streak by a rookie defenseman (Al MacInnis, Calgary Flames, 1984; Zarley Zalapski, Pittsburgh Penguins, 1989).
"I thought they were better tonight," Horvat said. "We knew they were going to come. They're the defending Cup champs for a reason. They know what it takes to win and they definitely weren't going to shy away from a fight."
Video: EA Sports Overtime Winner: Schenn
Faulk tied the game at 1-1 scoring off a turnover at 8:16 of the second. The defenseman has two goals in 27 games since Jan 15.
"It's always nice to put a couple in the net every now and then," he said. "It was a timely goal, I think, just to tie the game there, and hopefully some more come. More pleased with the outcome tonight than anything."
Allen, who did not start a game last postseason when the Blues won the Stanley Cup, made 37 saves in a 2-1 shootout loss to the Dallas Stars in the Stanley Cup Qualifiers on Aug. 9. He replaced Jordan Binnington, who had lost four starts this postseason.
"[Allen] was excellent," Blues coach Craig Berube said. "We hadn't got a win yet so changed it up, and Jake's been a real good goalie for us all year and again he was tonight. He's extremely prepared, works extremely hard. He doesn't take much time off. He's always out there practicing, whether it's on the ice or video. Just staying prepared. He's a real good pro."
St. Louis lost three round-robin games in the Qualifiers, plus an exhibition game, and had not won since March 11, its final game of the regular season (4-2 against the Anaheim Ducks).
"We know a seven-game series is long and it's not over after two games," Blues forward Tyler Bozak said. "We needed that one, and they're a great team. They're going to come again hard tomorrow and we've got to be ready for that and we have our best, and we expect a really tough, tough game tomorrow, so we've got to be ready."
Video: Schenn's OT winner propels Blues to Game 3 victory
Vancouver lost for the first time since Aug. 2, a 3-0 shutout in Game 1 against the Minnesota Wild in the Qualifiers.
"We're a shot away from being up 3-0," Canucks coach Travis Green said. "It's 2-1. We've talked about having short-term memory. … I think best part of tonight's game, the result, is that we get to play right away tomorrow."
NOTES: Blues forwards Vladimir Tarasenko and Alexander Steen (unfit) did not play, and Berube said they were day to day. As part of the NHL Return to Play Plan, a team is not permitted to disclose player injury or illness information. ... Canucks defenseman Tyler Myers didn't play; he left Game 3 in the third period after he appeared to go headfirst into the boards on a hit by Schenn.
NHL.com senior writer Dan Rosen contributed to this report