Jean-Gabriel Pageau scored the game's first goal with 53.2 seconds remaining in the first period, just minutes after Ullmark stopped Connor Brown on a breakaway. On the goal, Brady Tkachuk won a battle in the corner and fed a one-timer to Pageau from the right faceoff circle, who was able to beat Ullmark.
"It felt like we took over the second half of that period," defenseman Marco Scandella told Rob Ray during the first intermission on MSG. "It's unfortunate that we gave up that goal at the end, but I like the way we're playing right now so we're just going to keep at it."
Midway through the second, Ullmark was strong again, stopping Tyler Ennis on the doorstep while shorthanded.
The Sabres tied it up with 4:48 left in the second when Girgensons redirected a bouncing backhand attempt from the halfwall by Rodrigues.
However, the Senators regained the lead 5:16 into the third period when Pageau knocked in a rebound for his second goal of the game.
And with 9:17 remaining in the third, Anderson made a tremendous save on Rodrigues, diving backwards into the crease and stopping Rodrigues' effort with his out-stretched blocker.
Brady Tkachuk was then awarded a goal when he was tripped up by Henri Jokiharju with the net empty with 1:24 remaining in regulation.