Dumba scored twice, helping the Minnesota Wild to a 3-2 shootout win at Xcel Energy Center.
Charlie Coyle scored and Devan Dubnyk stopped Mike Hoffman in the fifth round of the shootout, giving Minnesota the bonus point. The Wild (34-22-7) have won three in a row, are 14-2-1 in their past 17 games and hold the second Western Conference wild-card position for the Stanley Cup Playoffs.
The loss ended Ottawa's five-game winning streak. The Senators (27-23-11) are six points behind the Boston Bruins, who own the second wild-card position in the East.
"When you have some guys out, it's an opportunity for some guys to come in and step up," Wild coach Mike Yeo said. "Certainly [Dumba] has taken advantage of it. Needless to say, it was a pretty strong game for him."
With defensemen Marco Scandella (undisclosed) and Jared Spurgeon (upper body) out with injuries and Nate Prosser playing just seven shifts, all in the first period, the 20-year old Dumba earned 19:25 of ice time, scoring the two goals and finishing a plus-1.
"I have confidence putting him on the ice in any matchup, any pairing," Yeo said. "The way that he plays the game, he's showing he can play some big minutes."
Dumba's first goal came 52 seconds into the second period on a booming slap shot from the point off a one-timer. Mikael Granlund gathered in a defensive-zone turnover by the Senators at the right circle and feathered a cross-zone pass to Dumba, whose slap shot went over goaltender Andrew Hammond's blocker.
Dumba scored again at 8:05, jamming in a rebound on the doorstep for his sixth goal. Chris Stewart got the first assist in his first game with Minnesota (34-22-7) after being acquired in a trade from the Buffalo Sabres on Monday. Granlund also had assist for his 14th career multipoint game.
"He always has the ability to create some offense, but what I like is his defensive game as much as anything right now," Yeo said. "He's giving us a lot right now."
The Senators (27-23-11) got one back less than 30 seconds later when Mika Zibanejad scored off a turnover at the blue line by Minnesota's Justin Fontaine. Defenseman Patrick Wiercioch held the zone and passed along the left wall to Bobby Ryan, who sent a bouncing puck over Wild defenseman Jordan Leopold's stick to Zibanejad alone in the slot for a snap shot that beat Dubnyk to the blocker side at 8:33.
Ryan tied the game at 2-2 at 11:48, scoring on a one-timer off a nice passing play from Hoffman and defenseman Erik Karlsson.
"You have to respond. You have to pushback at the right time," Senators coach Dave Cameron said. "We stuck with it. Falling behind 2-0, huge pushback, that's a big point for us."
Hammond, nicknamed "Hamburglar," lived up to the moniker, making 13 saves in the third period and overtime, including stops on partial breakaways by Coyle and Jonas Brodin. He also robbed Fontaine from point-blank range in the first period and stacked the pads to take a sure goal away from Granlund midway through the third. Hammond finished with 36 saves.
"He was good, made some big saves, especially late," Wild forward Zach Parise said. "He made some big saves in the third where we thought we had that go-ahead goal."
Ottawa nearly scored the go-ahead goal just prior to Granlund's chance, hitting the post three times in a 20-second span at the end of a power play spent almost entirely in the offensive zone. Two of those posts came off the stick of Zibanejad, who also ripped one off the metal in his shootout attempt.
"Really frustrating, especially when we don't win," Zibanejad said. "If we would have won this game, I really wouldn't have cared. Just gotta go to the shooting range and work on the shot."
"Sometimes they go in and sometimes they go out," Cameron said. "That's why they play the game. You play a certain way and get your looks. You live and die with the results."
Mikko Koivu and Jason Pominville scored in the first and third rounds of the shootout for Minnesota; Ryan and Kyle Turris did the same for the Senators. Coyle's quick backhand-forehand shot was his first attempt in the shootout this season and snuck under the crossbar, setting up Dubnyk, who flipped the right pad out to stop a wrist shot from Hoffman.
Dubnyk finished with 31 saves and is 16-3-1 in 21 starts with Minnesota. It was the first shootout for Dubnyk since being acquired from the Arizona Coyotes on Jan. 14 and his first shootout victory since Nov. 22.
"I really wanted to get that last one," Dubnyk said. "When you have two chances [to win] and they score on both. ... I really wanted to make that last one, so it felt good, especially when the points are as important as they are right now."