Nick Paul also scored for Ottawa (2-1-0), while Connor Brown’s three assists gave him 100 career helpers. Ottawa remains undefeated on home ice after two games (2-0-0).
Filip Gustavsson made 32 saves in his first regular-season NHL game since May 12.
Michael Raffl and Joe Pavelski scored for the Stars (1-2-0).
Anton Khudobin, who stopped 24 shots, suffered his first regulation loss against the Senators. Coming in, the Stars netminder was 8-0-2 against Ottawa.
Trailing 3-1, the Stars pushed back in the third. Pavelski was able to pick up a loose puck in front off a Radek Faksa rebound to make things interesting, but couldn’t complete the comeback.
Ottawa scored two power-play goals in the second to take a 3-1 lead but finished the period without Tim Stutzle. He returned to start the third.
Tierney picked up his first of the night as a Shane Pinto shot deflected off his chest at 9:20 of the second, and with one minute remaining in the period he took a pass from Zach Sanford and pushed the puck towards the net to beat Khudobin.
Of concern was a slash to Stutzle’s left wrist by Faksa that went uncalled. The 19-year-old left the ice hunched over in pain clutching his wrist.
The two teams exchanged goals in the first to make it 1-1.
The Stars scored on their first shot as Raffl had room in front and buried a feed from Alexander Radulov. Less than a minute later Paul tucked a backhander under the crossbar.
This marked the first American-based opponent to visit Canadian Tire Centre since March 5, 2020.
Notes: Brady Tkachuk did not play Sunday, but will likely make his season debut Thursday for the Senators. … Scott Sabourin and Victor Mete were healthy scratches for Ottawa. … Stars defenceman John Klingberg missed his second straight game with a lower-body injury suffered in the team’s season opener.