DENVER (AP) — Case Keenum already has this fourth-quarter comeback thing down pat.

Nail-biters are almost a prerequisite for a quarterback in Denver, where John Elway set the standard with 31 fourth-quarter comebacks and Peyton Manning added 11 of his league-best 43 while wearing navy and orange.

Keenum, the architect of the "Minnesota Miracle" in the playoffs last year, followed his comeback win in his Denver debut by leading the Broncos to a 20-19 come-from-behind win against Oakland on Sunday.

Brandon McManus kicked a 36-yard field goal just inside the right upright with 6 seconds left, capping a comeback from a 12-point second-half deficit.

The comeback denied Jon Gruden his first win as a head coach since 2008 — and his first against Denver since 2001.

With no timeouts and 18 seconds left, Keenum hit Tim Patrick for a 26-yard gain to the Oakland 18. Cornerbacks Gareon Conley and Leon Hall couldn't tackle him inbounds and McManus came on to give the Broncos their first lead.

The Raiders (0-2) lost despite Derek Carr completing 29 of 32 passes for 288 yards and a score four days after Gruden called him out for passing up throws to Amari Cooper in Oakland's opener.

Cooper caught 10 passes for 116 yards Sunday.

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