Erik Karlsson scored on a breakaway with 2:19 left in overtime and Ottawa Senators beat the Dallas Stars 3-2 on Monday night.
Karlsson picked up a loose puck after a missed Dallas opportunity and beat goalie Kari Lehtonen.
Stars goalie Ben Bishop left because of a lower-body injury after making 12 saves in the first period. Lehtonen replaced Bishop and had 15 saves.
Ottawa's Craig Anderson made 31 saves.
Dallas' Tyler Seguin scored twice, on the power play in the first period and from the top of the right faceoff circle with 1:02 left in the third period to tie it.
Goals by Mike Hoffman on the power play in the second period and Matt Duchene in the third gave Ottawa a 2-1 lead.
The Stars extended their lead for the first wild card in the Western Conference to three points over Los Angeles.
The Senators are 2-5-1 in their last eight games.
Seguin first scored from the left of the net on a narrow angle. His shot went in off Ottawa defenseman Ben Harpur's skate.
Play was stopped with 11:05 left in the first period after Bishop and Dallas defenseman Dan Hamhuis fell in a heap in front of the goal. A trainer attended to Bishop, who stayed in the game but didn't return for the second period.
Each team had two power plays in the second, and Ottawa cashed in on its second power play just two seconds before the period ended.
Mark Stone passed from the left faceoff circle across to Hoffman below the edge of the right circle. His shot went off the sprawling Lehtonen's upper left arm and into the net.
The Senators had a 12-8 advantage in shots on goal in the first period, but Dallas came back in the second to outshoot Ottawa 15-8. The closest the Stars came to scoring was with 1:40 left in the second when Anderson made a glove save on a shot by Antoine Roussel.
NOTES: Duchene has 33 points (13 goals, 20 assists) in 35 career games vs. Dallas. ... In the last six games, Seguin has seven goals and four assists. ... Ottawa RW Marian Gaborik returned after missing two games with an undisclosed injury. ... The Senators had killed 13 of 14 penalties in the previous six games. Dallas had been 17 for 18 over five-plus games.
Senators: Return home to meet Buffalo on Thursday.
Stars: Play at Central Division-leading Nashville on Tuesday. The Predators have won eight straight.