PITTSBURGH (AP) When he's at his best, Najee Harris is a blunt instrument. Powerful. Decisive. Destructive. Capable of imposing his will - usually in the form of a stiff arm - whenever the mood strikes.

The Pittsburgh Steelers running back displayed that in a 19-16 win over Atlanta on Sunday, shoving Falcons safety Richie Grant into the turf with his right arm during a first-quarter run that showed why head coach Mike Tomlin remains committed to Harris after a sluggish start.

While regularly fielding questions about whether Jaylen Warren should get increased playing time, Tomlin has praised the development of the undrafted rookie free agent but hasn't wavered in his support of Harris. Any path the Steelers had toward relevance on offense this season started with Harris, who spent the first two months playing behind a line that was spotty at best while standing next to a pair of quarterbacks finding their way in a new system.