Ryan Strome scored in sudden-death overtime to give Canada the win over Russia on Tuesday in their two-continent Challenge series.
Canada won Tuesday's regulation game, 4-2, to split the four-game series and set the stage for the deciding overtime period.
Ty Rattie scored two power-play goals and assisted on another to lead Canada to the Game 4 victory.
Strome, a New York Islanders prospect, then scored 3:20 into the extra period.
"I like that pull-and-drag shot, I've scored a few like that before," Strome said. "I saw a little bit of the mesh and put it on net and luckily it went in."
Rattie (St. Louis Blues) scored twice less than three minutes apart midway through the second period to give Canada a 3-2 lead. He assisted on Jonathan Huberdeau's third-period goal to cap the scoring in regulation.
Huberdeau (Florida Panthers) had two assists; Mark Scheifele (Winnipeg Jets) had three. Malcolm Subban (Boston Bruins) was the winning goaltender.
Andrei Sigarev, who scored the game-winner in Russia's 6-5 victory Monday, opened the scoring Tuesday with a goal at 14:23 of the first period.
Canada's Lucas Lessio (Phoenix Coyotes) tied the score 1-1 less than two minutes later.
Albert Yarullin put Russia ahead at 4:02 of the second period before Rattie scored at 9:51 and again at 12:47.
The teams each won one of the first two games of the series played in Yaroslavl, Russia. They then split the final two games, played in Halifax, Nova Scotia.
The Under-20 series was held to commemorate the 40th anniversary of the 1972 Summit Series, won by Canada four games to three with one tie.
Canada players said they got extra motivation from a pregame pep talk from Ken Dryden, a goaltender on that 1972 team, and a phone call from Phil Esposito, that team's captain.
Asked what Dryden said in the dressing room, Rattie said, "He said, 'This is your Team Canada, just run with it.'"
Stome said there also was motivation for some of the Canada players from last year's World Junior Championship, when Canada lost to Russia 6-5 in the semifinals.
"I think it was big for us," Strome said. "We had a bitter taste in our mouth from the World Juniors last year. ... This was a little bit of redemption."