Radulov received a cross-ice pass from Devin Shore in the right face-off circle before shooting past Smith to the short side to give Dallas a 2-1 lead.
"It was a whole battle on the power play," Radulov said. "At one point, I felt like it wasn't even 5-on-4, it was a 5-on-5. We battled. [Shore] made a great pass. I was kind of looking maybe to slide it to open net (to) someone, but then I saw I had free ice to skate and I just skated and took a shot, and it went in."
The Stars lead the NHL on the power play (32.4 percent). They have five power-play goals in the past two games -- Lindell, Radulov and Jamie Benn each had one in a 5-4 loss at the Edmonton Oilers on Thursday -- and have scored with the man-advantage in eight of their 11 games.
"We've got to get better 5-on-5 though, I can tell you that much," said Radulov, who has three goals. "The power play is good, but we've got to start scoring 5-on-5. That's a really big thing right now with our team."
Gaudreau put the Flames up 1-0 at 10:18 of the second period when he kept the puck on a 3-on-1 rush and scored off the crossbar over Lehtonen's glove. Gaudreau has 13 points (three goals, 10 assists) in his past 10 games.
Lindell scored with a one-timer from the point with 3:06 remaining in the second to tie the game 1-1. The power-play goal came 1:03 after Lehtonen made a blocker save on Backlund's shorthanded breakaway.
"I think we're just trying to get pucks to the net and just build from there," Lindell said. "It's been a good couple games for our [power-play] unit."
Lehtonen made 11 saves in the first period, including a blocker stop on Backlund at 9:45 on a setup by Matthew Tkachuk from below the goal line.
It was Lehtonen's second start of the season and first game since Oct. 7.
"Of course it's a huge win for him too and I guess a relief to get the first one of the season," Lindell said. "It gives us more confidence too when we know we can trust our goalies."
