Rasmussen gave Detroit a 1-0 lead at 7:21 of the first period when he deked Senators forward
Tim Stutzle
at the point and scored blocker side with a wrist shot.
"There's no doubt that right now we're beat down mentally," Red Wings coach Jeff Blashill said. "Now, that's not an excuse. We've got to fix that, but that's the reality of it, and we've got to climb our way out of it."
Artem Zub tied it 1-1 at 18:18 with a slap shot from the point.
Larkin cut it to 3-2 at 12:35 of the third period when he drove to the net and scored on the backhand.
"Everyone in our locker room is playing for something," Larkin said. "There's roles on the team next year, there's contracts, you're playing for a lot here. If that's not enough, you've got to play for the love of the game and come out and enjoy it, enjoy the grind of it and enjoy being in a one-goal game and playing the right way.
"I look around and I don't see a lot of joy. I don't see a lot of guys having fun, and we need to change that and enjoy playing hockey."
Nikita Zaitsev shot into an empty net for the 5-2 final at 19:15.
"They're a good team," Tkachuk said of Detroit. "They're kind of like us. They're a young team, up-and-coming. We'll be battling with them in the years to come in our division."
NOTES:Ottawa forward Tyler Ennis, who was playing in his 700th NHL game, left in the second period with an upper-body injury after taking a hit from Red Wings defenseman Gustav Lindstrom. Coach D.J. Smith said postgame Ennis is "likely done for the season." … Red Wings forward Sam Gagner was a late scratch due to a non-COVID-19 illness. … Norris has seven points (four goals, three assists) during a five-game point streak. … Joseph has seven points (three goals, four assists) in his past two games and eight (three goals, five assists) in six since being acquired from the Tampa Bay Lightning on March 20. … Ottawa held a ceremony prior to the game honoring owner Eugene Melnyk, who died Monday from an undisclosed illness. He was 62.