Indianapolis ? Perfection is now a thing of the past for the Indianapolis Colts.

Looking ahead isn’t so grim, though – especially with the Super Bowl still in their sights.

“It’s tough to go 16-0. You have to play well every week,” coach Tony Dungy said after his team was beaten, 26-17, by San Diego to end its 13-game winning streak.

No, the Colts weren’t happy – the locker room was quiet and emptied quickly.

But the last team to start 13-0, the 1998 Denver Broncos, went on to win the Super Bowl, and several players from that team say now that losing their 14th (and 15th) games made the final victory easier.

“I never think losing helps,” Dungy said. “But if it brings us back for the last two weeks with more resolve, maybe some good will come of it.”

indianapolis quarterback Peyton Manning reacts after he was called for intentional grounding against San Diego. The Chargers ended the Colts' bid for a perfect season with a 26-17 victory Sunday in Indianapolis.

The Colts erased a 16-0 deficit with a field goal and two touchdowns in a six-minute span of the third quarter. But the Chargers went ahead for good on a 49-yard field goal by Nate Kaeding with 6:41 left.

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Then Michael Turner clinched it with an 83-yard touchdown run after rookie Luis Castillo sacked Peyton Manning to knock the Colts out of field-goal range.

“I think they’re the best team in football. But all week, we felt we could beat them,” said San Diego rookie Shawne Merriman, who had two sacks and forced an important intentional grounding by Manning. “It will always go down in the books, no matter what happened before or after.”

The victory kept San Diego (9-5) alive for an AFC wild-card spot and prevented Denver from clinching the AFC West. The Chargers will need help to make the playoffs.

It also allows the Colts to rest starters for the final two games, having already clinched home-field advantage for the AFC playoffs.

A Colts fan reacts to the loss in the closing seconds.

And it certainly led to champagne celebrations by members of the 1972 Dolphins, the only team to complete a season undefeated.

“The only consolation now is that we won’t be asked all those questions, have all the media around and we can have more focus on our ultimate goal, to win the Super Bowl,” Dungy said.

The Colts played dreadfully for much of the game – almost as if they wanted to take off the pressure.

Manning was sacked on each of the first two series and also threw an interception, although he finished with 336 yards passing, many of them late in the game. Fortunately for Indy, Drayton Florence, who picked off the pass, fumbled it back as he was returning it.

Still, the Chargers were leading, 16-0, midway through the third quarter on a 29-yard TD pass from Drew Brees to Keenan McCardell and three field goals by Nate Kaeding.

“They were treating it like a playoff game, and we were, too,” Manning said. “I feel very disappointed that we lost the game.”

The Colts rallied behind their defense.

Trailing 16-3 after Mike Vanderjagt’s field goal, Gary Brackett intercepted Brees’ pass, setting up a one-yard TD run by Edgerrin James. Then Dwight Freeney sacked Brees to force a fumble, and Manning threw a one-yard TD pass to Dallas Clark.

Suddenly it was 17-16 with 40 seconds left in the third quarter, and the RCA Dome, quiet for almost three quarters, exploded in a raucous roar.

It got louder when McCardell fielded Hunter Smith’s punt on the goal line a few minutes into the fourth quarter and could get only to his eight. But McCardell atoned, catching a 54-yard pass from Brees, who finished 22-of-33 for 255 yards, to set up Kaeding’s field goal that put the Chargers up, 19-17.

Nick Harper’s end-zone interception after Dominic Rhodes fumbled the ensuing kickoff stopped one threat for the Colts. Manning drove the Colts down the field, but the grounding call when he was pressured by Merriman cost him 12 yards, and Castillo’s sack forced a punt.

Two plays later, Turner turned right end and raced untouched down the sideline for the clincher.

“We call multiple plays in the huddle or on the line. That’s called an alert,” Chargers coach Marty Schottenheimer said of the run by Turner, who was subbing for LaDainian Tomlinson, who bruised his ribs. “We see what they show. Then we either run the play or run the alert. That was the alert.”

That was the alert that made the 1972 Dolphins happy. It might be the alert that takes the pressure off the Colts en route to an NFL title.