The Ducks (42-32-6) would have clinched their first Stanley Cup Playoff berth in eight seasons with a win of any kind. Anaheim, which has lost seven of eight (1-5-2), is third in the Pacific Division, three points ahead of the Los Angeles Kings, who have a game in hand.
“Disappointed," Ducks captain Radko Gudas said of the missed opportunity. "I thought we had had a great start. I thought we battled in the third. We played really great hockey (in the third), so we need to play that hockey for 60 minutes.”
The Ducks can clinch a playoff spot if the Nashville Predators lose in any fashion at the San Jose Sharks on Monday. Otherwise, Anaheim's next opportunity to clinch will be at the Minnesota Wild on Tuesday.
"Unfortunately, we have to watch it. We wanted not to have to," Gudas said of the Nashville game. "It's going to be (Monday). If not, then Tuesday is a big game for us again."
Rossi also had an assist, Curtis Douglas scored his first NHL goal, and Jake DeBrusk and Brock Boeser also scored for the Canucks (24-48-8), who were coming off a 4-3 shootout win at the San Jose Sharks on Saturday. Nikita Tolopilo made 24 saves.
"Easily could have not played with the intensity or urgency we've seen the last three or four games, but they keep pushing and they're gelling together," Vancouver coach Adam Foote said. "Give them a lot of credit, they've really connected as a group."