The entire defense did, limiting the Browns, who have scored just one touchdown in their last 33 quarters, to 200 yards of offense, just 56 of that on the ground.
The Broncos, who beat Cincinnati last week on Brandon Stokley's 87-yard touchdown catch with 11 seconds left, are unbeaten under new coach Josh McDaniels, who worked with Browns coach Eric Mangini in New England. Mangini's new team is 0-2.
Despite appearances, Dumervil said he's still a work in progress in the Broncos' new 3-4 scheme.
Dumervil said he has a long way to go to feel comfortable in the 3-4, but it's proving the perfect fit for this unorthodox player who has long arms for a man who stands just 5-11, as Pro Bowl tackle Joe Thomas saw over and over Sunday.
So, Dumervil often finds himself standing over a crumpled quarterback with a big lineman sprawled out behind him.
Quinn finished 18 of 31 for 161 yards and an interception on his final toss.
Denver quarterback Kyle Orton, who completed 19 of 37 passes for 263 yards and a touchdown, was having another ordinary day until he hit Jabar Gaffney with a 49-yard pass that led to Peyton Hillis' 2-yard TD run early in the fourth quarter.
That broke open a 13-6 game and atoned for Hillis' lost fumble on the opening kickoff.
Running back Correll Buckhalter then broke free for a 45-yard touchdown rumble that made it 27-6.
Before the Broncos' offense picked up steam, the crowd booed Orton for some badly thrown passes on a windy day at Invesco Field and jeered kicker Matt Prater, who missed from 37 and 39 yards but was good from 23 and 38.
The defense was the only unit that wasn't erratic. In two games, the Broncos have allowed just one touchdown.
Providing the early spark Sunday was Davis, who had eagerly awaited facing the team that let him go after seven seasons without so much as a goodbye from its new coach.
When the Browns didn't make him an offer, Davis signed a two-year deal with the Broncos, who spent the offseason revamping a deplorable defense that ranked at or near the bottom in every major category last season and surrendered 448 points.
Davis recorded seven solo tackles and two assists in the first half.
The Broncos are now 2-0 go Broncos!