Green Bay and Baltimore secured play-off berths and the Dallas Cowboys boosted their post-season chances with a 27-24 overtime victory over Pittsburgh on "Showdown Sunday" in the National Football League.
Six match-ups of NFL clubs with winning records prompted extra attention with only two weeks of the season remaining. Never before had so many games between teams with winning records been staged on the same day so late in a campaign.
Atlanta and Houston, each 12-2, kept their edge in the chase for home-field play-off advantage while Green Bay beat Chicago 21-13 to clinch the NFC North division title and Baltimore sealed a play-off spot when Dallas beat Pittsburgh.
Brandon Carr intercepted a pass from Pittsburgh's Ben Roethlisberger in overtime and returned it just short of the goal line to set up Dan Bailey's game-winning 21-yard field goal for Dallas.
"I just broke for the ball and waited for it to come my way," Carr said. "I saw it clear as day. I jumped for the ball, went with my instincts and got it."
Dallas defensive tackle Josh Brent, charged with drink-driving manslaughter in the car crash that killed teammate Jerry Brown, was on the sidelines for the Cowboys although not in uniform. He is free on bond, but suspended by the team.
All NFL contests observed a pre-game moment of silence in tribute to the 27 people, 20 of them children, who were killed on Friday by a gunman at a primary school in Newtown, Connecticut.
New York Giants players wore helmet decals with the initials "SHES" for Sandy Hook Elementary School, where the tragedy took place.
The Giants suffered their fourth loss in six games when hosts Atlanta beat New York 34-0. Matt Ryan threw three touchdown passes, two to Julio Jones, and the Falcons' defence imposed the first shutout on the Giants since 1996.
San Francisco clinched a play-off berth with a 41-34 win over New England.
New York fell to 8-6 with the loss, allowing Dallas and Washington to match the Giants atop the NFC East division with two weeks remaining in the season.
Kirk Cousins, making his first NFL start as a replacement for injured fellow rookie Robert Griffin III, threw for 329 yards and two touchdowns to spark Washington to a fifth consecutive victory with a 38-21 triumph at Cleveland.
The Redskins are on their longest win streak since 2005. "The coaches had a great game plan," Cousins said.
"They kept it simple and put me in situations that allowed me to be successful."
Green Bay's Aaron Rodgers completed 23-of-26 passes for 291 yards and three touchdowns, all to James Jones, and the visiting Packers downed their arch rivals to seal a playoff trip.
The Packers, 10-4, have lost only once in their past nine games while the Bears fell to 8-6 with their third loss in a row and fifth in six games.
Matt Schaub completed 23-of-31 passes for 261 yards and a touchdown and Arian Foster ran 27 times for 165 yards to power host Houston over Indianapolis 29-17, clinching the AFC South title for the 12-2 Texans.
The Colts fell to 9-5 but remain in position for a wild-card play-off spot.
Peyton Manning completed 17-of-28 passes for 204 yards and a touchdown to spark the Denver Broncos to their ninth victory in a row, a 34-17 romp at Baltimore.
AFC West champions the Broncos, 11-3, have not won so many consecutive games since taking 13 in a row in 1998 on the way to a Super Bowl title.
It was the third loss in a row for the Ravens, who fell to 9-5 and remain only one game ahead of Cincinnati in the AFC North.
In Buffalo's fifth annual regular-season game at Toronto, Seattle quarterback Russell Wilson ran for three first-half touchdowns in the Seahawks' 50-17 rout of the Bills.
The Seahawks became only the third team in NFL history to score 50 points in consecutive games and improved to 9-5, remaining the team to beat for an NFC wild-card berth.
Adrian Peterson ran 24 times for 212 yards and a touchdown to lead Minnesota over hosts St Louis 36-22 and into the NFC play-offs hunt at 8-6. He needs just 293 to equal Eric Dickerson's one-season NFL record with two games to play.