INDIANAPOLIS — Peyton Manning didn't have a touchdown pass or throw for 300 yards, so along comes backup running back Mike Hart to rescue the Colts and hand Kansas City its first loss.
With Manning missing receivers all day, Hart found an inside crease in the Chiefs defense, crashed through three players for 11 yards and scored the game's only touchdown with 4:02 left to give the Colts a 19-9 win Sunday.
The result leaves the NFL without an undefeated team just five weeks into the season.
"It's moments like this that you don't get all the time and when they pop, you try to take advantage of it," Hart said. "It's fun."
The 5-foot-9 Hart got his chance when Joseph Addai went down midway through the third quarter with what appeared to be a right shoulder injury.
Hart carried 11 times for 50 yards, both career highs.
"Mike did a great job," said Manning, who threw for 244 yards and one interception. "He had an interesting week practice wise. He got injured during the week and didn't know quite what was going to happen. Next thing you know, he comes out and does a heck of a job for us."
Kansas City, with four straight wins dating to last season, brought a defense that hadn't allowed more than 14 points in a game all season — until Hart's scoring run.
"Once I got the ball, the O-line, they took care of the front seven," Hart said. "I had two safeties back there and I was on the 3- to 4-yard line and it was my job to get in from there."
With Manning having a rare off day, the Colts featured a more balanced attack. The problem was, Indy deactivated backup running back Donald Brown, and when Addai was hurt, the Colts had to turn to Hart.
On a normal day, Kansas City's defensive effort might have been good enough to beat the Colts.
But the Chiefs didn't get into the end zone, settling for three Ryan Succop field goals. He missed a 51-yarder with 1:17 to go, ending Kansas City's hopes.
"We're a team trying to transition into becoming a good team. We're not there," Chiefs coach Todd Haley said. "If we had won this game, I'd be saying the same thing. Good is much bigger than four games. Good is measured a little differently, but we are transitioning and we are making progress."