MIAMI — Marlon Moore couldn't hang on. Neither could the winless Dolphins.
Moore's bobble of an onside kick was one of several costly misplays by the Dolphins, who gave up two touchdowns in the final 2:44 of regulation and lost to Tim Tebow and the Broncos 18-15 in overtime Sunday.
The Broncos took over at their 20 with 5:23 left, down 15-0. Tebow led TD drives of 80 and 56 yards sandwiched around the onside kick, and he scored a two-point conversion with 17 seconds left to tie it.
In overtime, Denver's D.J. Williams, who played at the University of Miami, sacked Matt Moore to force a fumble and recovered it at the Miami 36. Three plays later Matt Prater hit a winning 52-yard field goal.
Miami extended the NFL's longest losing streak to nine, leaving the status of coach Tony Sparano even more tenuous.
"He's the head coach, and he's going to take a lot of heat," receiver Brandon Marshall said. "But trust me, it's not him. Not just him. It's all of us."
It's the first time since the 1970 AFL-NFL merger that a team won after trailing by 15 or more with three minutes left.
With the Broncos on the verge of their first shutout since 1992, Tebow — the former Heisman Trophy winner at Florida who made his first start this season on the day the Dolphins honored the Gators' 2008 national title team — led an eight-play touchdown drive that got them back in the game.
"It's tough to say, but man, Timmy did a great job," said Dolphins center Mike Pouncey, Tebow's college teammate. "Hopefully the critics will get off him about what he can't do and talk about the things that he can do, and that's figure out a way to win the game, no matter what."