Vokoun was among the reasons Nashville got close to Edmonton for the final postseason spot in the West. He went 9-2-1 during one stretch to get the Predators within four points of the Oilers on March 1.
But Vokoun cooled off as Nashville fell 11 points off the pace. The tie left him winless in his last six games and 1-5-3 in the last nine.
“It’s been tough since that game with Edmonton,” Vokoun said, referring to Monday’s 5-3 loss to the Oilers. “That kind of killed our spirit a bit. But we have a job to do. We have to make sure we regroup and finish strong.”
Vokoun appeared on the way to his fourth shutout, but a giveaway by defenseman Cale Hulse just inside his own blue line led to Betts’ second NHL goal with 6:24 to go in regulation.
“It was good to get one,” Betts said. “I just want to contribute on getting better every day. You see an opportunity and now I’m happy with the way things are going.”
Starting for the 49th time in 50 games, Vokoun stopped 23 shots through 40 minutes while his teammates managed just eight. But he produced stellar stops on Craig Conroy and defenseman Bob Boughner late in overtime.
Also in the extra period, Calgary’s Shean Donovan appeared to get the game-winner off a scramble in front. But Vokoun was able to pull the puck off the goal line, a play that was reviewed by the video replay official.
“The puck was right on the line,” Vokoun said. “I reached back and slapped it out.”
“I thought when the puck hit the white bumper pad it was a goal,” Flames coach Darryl Sutter said. “But there was snow built up around it and they have to review it. I guess it was more conclusive when they went upstairs and the ref waved it off.”
Petrov breezed past a defender and converted a pass from behind the net from former Flame Clarke Wilm. It was his second goal in nine games since he was acquired from Montreal.
The lead lasted just over five minutes as Hulse fanned on a pass and Betts scooped up the loose puck before lifting a shot over Vokoun.
The Flames played without red-hot Jarome Iginla, who sat out with a shoulder injury suffered in Thursday’s loss to Washington. They are are 6-3-2 in their last 11 games but will miss the playoffs for the seventh straight season.