Ridly Greig with a pair of goals led the way for Ottawa. Drake Batherson and Jake Sanderson also scored.
This was the final meeting between the two teams with Colorado taking the first game 6-4 on Dec. 21.
Ottawa took the lead early in the second when Annunen juggled a Brady Tkachuk shot and Greig poked the puck in. Colorado tied it just over one minute later when Polin beat Sogaard with a snap shot to the far corner for his first NHL goal.
Greig gave the Senators the lead at the seven-minute mark with his second of the night and Sanderson with a beautiful move made it 4-2 at the midway mark of the period.
Colorado appeared to make it a one-goal game on a Malinski goal, but upon review it was ruled offside, but just over a minute later Rantanen made it count with his second of the game.
The teams exchanged first period goals.
Ottawa opened the scoring with a power-play goal when Batherson drilled Logan O’Connor with a shot and then fired the puck home, but just 38 seconds later Colorado tied the game when Rantanen, from one knee, tipped in a Cale Makar shot.
NOTES
Senators C Josh Norris missed his third straight game with a lower-body injury and Jacob Bernard-Docker was a healthy scratch.
UP NEXT
Senators: Host the Montreal Canadiens on Thursday.
Avalanche: Head to Boston to play the Bruins on Thursday.
This report by The Canadian Press was first published Jan. 16, 2024.
Lisa Wallace, The Canadian Press
