Mattias Samuelsson scored the lone goal for the Sabres and Ukko-Pekka Luukkonen stopped 20 shots.
Eller gave the Senators a 2-1 lead by tipping Artem Zub’s shot for his fifth of the season.
The Sabres pulled Luukkonen with 2:39 remaining and Greig iced the game 21 seconds later before Pinto added a second empty-netter.
Buffalo opened the scoring midway through the second period when Samuelsson beat Ullmark glove side with a wrist shot from the top of the circle.
Ottawa tied it with former Sabre Cozens tipping a Brady Tkachuk shot from in close.
A scoreless first provided plenty of action.
Their blue line already depleted, the Senators lost defenceman Tyler Kleven six minutes into the game after he exited from a Bowen Byram shot to the face.
Tkachuk was assessed a penalty from the bench after slashing Beck Malenstyn. The Senators captain later dropped the gloves with towering defenceman Logan Stanley.
Takeaways
Senators: Managed to hold off the Sabres with just five defencemen after Kleven left the game. The Senators were already without Jake Sanderson, Thomas Chabot, Nick Jensen, Dennis Gilbert and Carter Yakemchuk on the blue line. Ottawa native Cameron Crotty was recalled from the AHL’s Belleville Senators on Thursday.
Sabres: Had a solid first period but didn’t keep the same pressure through the final 40 minutes.
Key Moment
With five seconds remaining in the second period, Ullmark made a crucial sliding save on Byram.
Up next
Senators: Host the Minnesota Wild on Saturday.
Sabres: Visit the Washington Capitals on Saturday.
This report by The Canadian Press was first published April 2, 2026.
Lisa Wallace, The Canadian Press