NASHVILLE, Tenn. (AP) — The Pittsburgh Steelers stand alone as the AFC’s last undefeated team thanks to a dominant start and a bit of late luck.

Ben Roethlisberger threw two touchdown passes to Diontae Johnson, and the Steelers remained perfect by holding off Tennessee for a 27-24 victory Sunday in a game postponed three weeks after the Titans came down with the NFL’s first COVID-19 outbreak of the season.

In a matchup of the conference’s two remaining unbeaten teams, the Titans rallied by scoring 17 straight after being smothered in the first half.

They failed to complete the comeback when Stephen Gostkowski, who made a 51-yarder earlier, missed wide right from 45 yards with 14 seconds left, sending the Steelers running around the field in celebration and stunning the Titans (5-1). Even Roethlisberger appeared shocked the four-time Pro Bowl kicker missed.

“Oh, man. I mean, I was surprised he missed it,” Steelers wide receiver JuJu Smith-Schuster said. “Our idea was to go into overtime. A good kicker. It’s tough. It’s good for us.”

The Steelers improved to 6-0 for their best start since 1978, when Pittsburgh won its first seven on the way to the Super Bowl. This was just the fifth time undefeated teams had met in Week 7 or later, and the winner of the previous four all made the Super Bowl.

“We feel we have a really good football team,” Roethlisberger said. “We feel we can be really special ... That’s going to be a short-lived happiness because we know what’s coming next.”

What comes next? A matchup with the rival Ravens.

“We are perfect from a record standpoint, and so we respect that,” Pittsburgh coach Mike Tomlin said. “We realize that we’ve got AFC North ball on next week on the road. We’re going to a group that has seven days’ advantage on us, so there’s a lot for us to be urgent about.”

Benny Snell Jr. added a 1-yard TD run, and Ray-Ray McCloud set up a touchdown with a 57-yard punt return. Pittsburgh scored at least 26 points for a sixth straight game to tie a stretch in 2015 for the longest in franchise history.