MIAMI GARDENS, Fla. -

The Miami Dolphins led for 50 minutes. They finally got some big plays from Mike Wallace. They played perhaps their best defensive game of the season.

And with 2½ minutes left, the Dolphins needed only a defensive stop on fourth-and-10 to seal a victory over Carolina.

Professor Will's report card

But they couldn't close it out. Cam Newton's 19-yard completion gave the Panthers a first down, and they drove 80 yards for the winning touchdown in the final minute to beat Miami 20-16.

The fourth-down conversion was a backbreaker.

"I'm not sure there's any other word to describe that," defensive lineman Jared Odrick said.

"That's when the tide shifted in our favor," Newton said.

The Dolphins (5-6) fell to 2-2 since tackle Jonathan Martin left the team and Miami's bullying scandal began to mushroom. After taking a 16-3 lead, they were shut out in the second half.

"We've got to make plays at the end when it counts," Wallace said. "We've got to have a killer instinct. I don't think we have it that well right now. We've got to do a better job of putting teams away."

The Panthers (8-3) extended their winning streak to seven games, their longest since 2003.

The Panthers trailed 16-13 when their winning drive began at their own 20 with 4:13 remaining. Down to one timeout, they went for it on fourth down, and Newton threaded a pass between two defenders to Steve Smith for a 19-yard gain.

Vic's Picks: Breakdown of Dolphins-Panthers

Carolina then converted two third downs before Newton hit Greg Olsen on a 1-yard pass for the winning score with 43 seconds left.

Ryan Tannehill nearly connected with Wallace for a 60-yard score in the final seconds, but the pass fell incomplete at the goal line.

"That's a tough play," Tannehill said. "You're basically a hope and a prayer and get it out there."

"A little scary," Carolina coach Ron Rivera said.

Tannehill, who had repeatedly underthrown the speedy Wallace this season, was told this week by coach Joe Philbin to "let it rip" and did so in the first half, twice hitting the Dolphins' $60 million receiver deep. They connected for a 53-yard touchdown and a 57-yard completion to set up a field goal.

Tannehill also overthrew an open Wallace deep in the third quarter.

Fins Flash: Will's take on the Dolphins loss

Newton's interception led to another Miami field goal, and he finished with a quarterback rating of only 60.6. But he was at his best with time running out.

Following the Panthers' uncharacteristically slow start, he led them 52 yards for a field goal in the final 61 seconds of the first half with no timeouts left, taking advantage of Miami's soft coverage to cut the deficit to 16-6.

Rivera's willingness to take chances paid off in the third quarter. From the Panthers 41, Newton ran for 8 yards to convert a fourth-and-1, and they went on to complete an 83-yard touchdown drive to make the score 16-13.

"They have been calling our coach Riverboat Ron because he likes to gamble," Newton said.

For the second game in a row, the Panthers' Luke Kuechly made a big play in the end zone that was disputed. He appeared to make helmet-to-helmet contact when he broke up a potential touchdown catch by Rishard Matthews, and an official threw a flag, but the referee determined there was no penalty and Miami settled for a field goal and a 16-3 lead.

Kuechly bear-hugged the Patriots' Rob Gronkowski on the final play of the Panthers' victory at New England last Monday.