"Now we know what I believe 60 minutes looks like for our hockey team, and that's what we've got to do if we want to continue to win games," Ottawa coach D.J. Smith said.
Evander Kane and Kevin Labanc scored, and Brent Burns had two assists for the Sharks (4-7-1), who have lost four of their past five games. Aaron Dell allowed four goals on 22 shots before being replaced at the start of the third period by Martin Jones, who made seven saves.
"We're 12 games in and there's a handful of key guys for us that haven't played well yet," San Jose coach Peter DeBoer said. "So that's on me to get them back to the level they need to be at.
"We're playing from behind in a lot of these games, and instead of sticking with it and trusting the group and the system, everyone wants to step out and fix it themselves, but it doesn't work that way. So eventually you have to learn that lesson."