Dylan Larkin scored, and John Gibson made 21 saves for the Red Wings (33-19-6), who have lost four of five (1-3-1).
“We had a disappointing start,” Detroit coach Todd McLellan said. “I thought we created enough opportunities to get ourselves back in the game. We couldn't beat a real hot goaltender, and that was probably the difference.”
Durzi gave Utah a 1-0 lead 57 seconds into the first period, picking up a loose puck on the end boards and beating Gibson blocker side.
Schmaltz scored on a 5-on-3 power play to extend it to 2-0 at 8:11, beating Gibson glove side with a wrist shot.
Guenther pushed it to 3-0 at 4:40 of the third period, slotting the puck between the legs of Gibson.
“We played well from the start. PK was really good, [Vejmelka] obviously really good, but just the team effort,” Guenther said. “I think it's big. Everybody knows that [the standings are] really tight… it's going to be close, and every point matters.”