Stastny scores Avs' winner in third
David Jones also scored, and Jean-Sebastien Giguere stopped 21 shots for the Avalanche. Colorado rebounded from a 3-2 overtime loss in Nashville on Thursday night that dropped them to 0-2-1 in their last three. They are 10-3-1 in their last 14.
Vernon Fiddler scored for Dallas, and Lehtonen made 21 saves.
The Stars were 3-1-0 in their previous four and were coming off a 5-4 shootout victory at Los Angeles on Thursday night.
Dallas had a chance to tie it when Colorado's Daniel Winnik was whistled for high-sticking with 1:18 remaining. Lehtonen remained on the bench after a Dallas timeout, giving the Stars a 6-on-4 advantage.
Michael Ryder had the best opportunity to push the game into overtime, but the Stars' top goal-scorer wasn't unable to control a bouncing puck and tap it into an open net with about 20 seconds left.
Jones took advantage of a misplay by Lehtonen to give the Avs a 1-0 advantage at 10:25 of the first period.
Lehtonen had gone behind his net to play the puck, but his poor clearing attempt ended up on the stick of Stastny, who fed Jones in front of the net for an easy goal, his ninth of the season.
Colorado held a 7-1 shots edge in the first period, indicative of Dallas' sleepy start.
The Stars were better in the scoreless second period, but were still outshot 13-8.
Fiddler tied it at 5:26 of the final period, skating from behind the net and backhanding a loose puck past Giguere for Fiddler's sixth goal of the season.
NOTES: Forward Tomas Vincour (knee), D Philip Larsen (concussion-like symptoms) and C Mike Ribeiro (knee) sat out for Dallas. ... The Avs were without LW Matt Duchene (knee) and D Shane O'Brien (knee). ... Colorado C Peter Mueller played his second game after missing 40 games because of a head injury. Mueller nearly gave his team a 3-1 lead with 4:24 left, but his attempt from in front of the net was turned aside by Lehtonen. ... The Stars had scored four goals or more in five of their previous six games.