Larkin has nine points (five goals, four assists) in his past seven games. He scored nine goals in his first 72 games.
"I wish I was scoring these goals with us driving for the playoffs, but we're still trying to have the best finish we can," Larkin said. "There are a lot of young guys here who are fighting for a spot on the team next year, or more ice time, so we're going to do our job every day."
The Senators were 0-for-3 on the power play in the first two periods.
"It was a hard game to generate anything offensively," Ottawa forward Matt Duchene said. "Our power play has been brutal all year, and that's one of the main reasons we're in this position right now."
Athanasiou was called for delay of game at 1:55 of the third period. Howard saved Erik Karlsson's wrist shot from the left face-off dot.
"I think Jimmy has been our MVP this season, so I'm glad he finally got a shutout," Larkin said.