KANSAS CITY, Mo. (AP) -- Le'Veon Bell ran for 179 yards and a touchdown, Antonio Brown made an acrobatic touchdown catch in the fourth quarter and the Pittsburgh Steelers held on to beat the Kansas City Chiefs 19-13 on Sunday.
The Chiefs (5-1) still had a chance after Brown's 51-yard reception made it 19-10, moving quickly downfield and getting a 33-yard field goal from Harrison Butker.
And when their defense forced a quick three-and-out, Tyreek Hill's 32-yard punt return gave them the ball with 1:48 to go.
But after the Steelers (4-2) gave up a first down, James Harrison sacked Alex Smith on third-and-10, and the quarterback's incomplete pass on fourth down left the NFL with no unbeaten teams.
Ben Roethlisberger was 17 of 25 for 252 yards for Pittsburgh, bouncing back from his abysmal five-interception performance against Jacksonville last week.
His favorite target was Brown, who a few weeks ago was flipping over water coolers on the sideline but spent Sunday slinging high-fives.
He finished with eight catches for 155 yards, often beating All-Pro cornerback Marcus Peters.
The game in many ways resembled January's divisional playoff game at Arrowhead Stadium, when Bell churned for 170 yards rushing and the Steelers' defense shut down the Chiefs in an 18-16 victory.
Their defensive dominance was even more impressive considering the circumstances: The Steelers had allowed more than 200 yards rushing twice in the past three weeks, while Kareem Hunt ran for 107 yards and the Chiefs piled up 450 yards in a shootout victory last Sunday in Houston.
Kansas City rolled into the game averaging 414.2 yards and 32.8 points, but the Steelers shut down NFL rushing leader Hunt, who gained just 21 yards on nine carries. They also spent the afternoon with their paws on Smith's jersey, holding the league's top-rated passer to 246 yards and a touchdown.
Still, Smith nearly rallied the Chiefs in the second half, hitting De'Anthony Thomas down the sideline for a 57-yard fourth-quarter touchdown that got Kansas City within 12-10.
But the Steelers answered with Bell, whose hard running got them near midfield. And when they faced third-and-2, former Chiefs coach and Steelers offensive coordinator Todd Haley dialed up a pass down the sideline to Brown, who caught the tipped ball and ran it 51 yards for the score.
It was Brown's 52nd touchdown reception, passing Lynn Swann for third-most in franchise history.
The Chiefs' first turnover since their first offensive play of the season came in the first half, when backup center Zach Fulton snapped the ball over Smith's head for a safety. But the Steelers gave the ball right back when they inexplicably decided not to field the ensuing free kick.
Steelers RT Marcus Gilbert, who had missed three weeks with a hamstring injury, left in the first half after aggravating it. LB Vince Williams left in the second half with a hip injury after picking up a pair of sacks. ... Chiefs RB Charcandrick West was evaluated for a concussion.
Steelers: Return home to face Cincinnati on Sunday.
Chiefs: Visit the Raiders on Thursday night.