Rapid Reaction: Denver 18, Miami 15, OT

Here are some thoughts on the Denver Broncos' 18-15 overtime victory against the Miami Dolphins:

What it means: This could be the final blow for Miami coach Tony Sparano. The Dolphins blew a 15-0 lead at home in the fourth quarter to an equally struggling Denver team. Sparano is expected to get the boot by the end of the season. But now it could happen much sooner -- perhaps as early as this week. It was Sparano's seventh straight loss at Sun Life Stadium. Miami (0-6) also remains the favorite in the Andrew Luck Sweepstakes by losing to Denver (2-4).

Tebow heats up late: The much-anticipated Tim Tebow era did not get off to a good start. But Tebow heated up late to pull the victory out in overtime. Tebow struggled most of the game with his accuracy and was battered by Miami's defense. He completed 13 of 27 passes for 161 yards and two fourth-quarter touchdowns. He also had a key two-point conversion to tie the score near the end of regulation.

Offensive offenses: This game was not pretty. It very much played out like a pair of teams going nowhere, particularly on offense. Neither team could muster a touchdown until Miami scored one early in the fourth quarter. The first third-down conversion didn’t come until late in the third quarter. Give both defenses some credit. But the game mostly had poor execution on offense.

What's next: The Dolphins will be on "Sparano Watch" before going on the road for two weeks. Miami will play at the New York Giants on Oct. 30. Then the Dolphins will travel to play the Kansas City Chiefs on Nov. 6.