The Slovakian defenceman scored in the 12th round of the shootout as the Edmonton Oilers snapped a two-game losing skid with a 4-3 victory over the struggling Boston Bruins on Wednesday.
Marincin, who had never scored a goal in the NHL, was credited with the winner on a bit of a flub play as he whiffed on his attempt, but it still trickled past Boston starter Boston starter Tuukka Rask.
"That felt great," he said. "That was my first NHL goal and it came on my birthday. I just tried to make a move and the ice was bad, so I guess I had some good luck."
Marincin was the only player to score in the shootout as both clubs combined to go 0-for-23 leading up to his attempt.
Nail Yakupov, Ryan Nugent-Hopkins and Teddy Purcell scored in regulation for the Oilers (17-32-10), who ended a 13-game losing streak against Boston that extended back to 2001.
Oilers forward Jordan Eberle, who recorded two assists, said Marincin's inexperience may have been an advantage.
"If you don't even know what you are doing, there is no way (the goalie) does. It ended up working," he laughed.
Loui Eriksson, Reilly Smith and David Pastrnak replied for the Bruins (28-20-9), who have now lost five games in a row and are in danger of slipping out of the Eastern Conference playoff picture.
"We know it's going to be a fight until the end," said Bruin Zdeno Chara. "This is not a group that is going to give up, we're going to fight for every point, every game. We know we can get it together like we did before."
The Oilers were buzzing in the early going in and it paid off four-and-a-half minutes in as Derek Roy made a pass from behind the net to Yakupov, who beat Rask to extend his point scoring streak to six games.
Edmonton went up 2-0 on the power play. With four minutes left in the first Purcell sent a pass through the top of the crease to Nugent-Hopkins, who blasted home his 16th of the season.
Boston got on the board with a power-play goal of its own with 20 seconds left in the opening period as Eriksson tipped a Dougie Hamilton shot past Oilers goalie Ben Scrivens, who was making his return from a hamstring injury.
The Oilers restored their two-goal lead with another power-play goal nine minutes into the second as Purcell scored on a wrist shot through traffic from the high slot.
The Bruins made it 3-2 with six minutes left in the middle period as Smith picked up a rebound in front of the Oilers net and whacked it past Scrivens.
Less than two minutes later it was a 3-3 game as Pastrnak ticked a rocket of a shot from the point by Zdeno Chara into the Edmonton net.
There was no scoring in the third or overtime despite a pair of glorious chances for Milan Lucic, sending the game to the extended shootout session.
Both teams return to action on Friday as the Bruins play the fourth game of a five-game trip in Chicago. Edmonton will remain home to face the Minnesota Wild.
Notes: There was some speculation that recent call-up Malcolm Subban would get his first NHL start in net for the Bruins, but they opted to give Rask his 24th appearance in the past 25 games… Oilers defenceman Jeff Petry (ribs) and forward Anton Lander (shoulder) left the game after the second period.