
The final pair of unbeaten teams in the NFL watched their flawless starts shattered during week five as both the Philadelphia Eagles along with Buffalo Bills endured surprising losses on their own turf.
Denver's football team evolved from underdogs to headline-makers thanks to an spectacular comeback victory against the reigning Super Bowl champions the Eagles, prior to boarding a flight for Sunday's London matchup.
New England's squad then visited Buffalo and ended Buffalo's undefeated start with an impressive victory of their own in their initial national television game in twelve months.
The Baltimore Ravens experienced a third straight loss - their defensive woes could be fatal for their play-off aspirations - while Dallas, Indianapolis, and Detroit enjoyed blowout wins on another action-packed Sunday.
Not only was it beating the Super Bowl champions, but the manner of their comeback from 14 points down that made Denver's win by 21-17 in Philadelphia such a defining achievement.
The Eagles had won 10 games consecutively, 12 straight at home and 20 of their last 21 overall before Denver's signal-caller Bo Nix orchestrated two scoring drives in five fourth-quarter minutes and a last-minute three-pointer.
The Eagles are now 4-1 but there is significant concern about their offensive unit, which ranks as the poorest performing in the league. Receiver DaVonta Smith says they are not "in sync" with quarterback Jalen Hurts.
The Broncos' defensive unit, which tackled Hurts six times, had much to contribute with the outcome, and, together with a genuine franchise quarterback in Nix and elite coach in Sean Payton, they have all the ingredients to mount a serious challenge.
Denver face New York's Jets at Tottenham Hotspur Stadium on Sunday.
If Denver's win was almost half expected, nobody saw New England traveling to Buffalo and beating Josh Allen's Bills, but they accomplished it with huge character.
A first primetime game for Drake Maye produced a star-making showing as he directed a game-winning scoring drive in the final moments to secure victory 23-20.
Maye was resilient and made the right throws at crucial moments, many to ex-Buffalo wideout Stefon Diggs, who had a big game for their coach's team.
The head coach was expected to improve the situation in New England, but such a significant victory arrived sooner than many predicted.

The Patriots defence contained Buffalo's offensive efforts during their surprising away win.
The season is becoming a nightmare for Baltimore, who were missing a host of key defenders as they were dominated 44-10 by the Houston Texans.
It matched their largest home defeat, and falling to 1-4 for the season means one of the pre-season Super Bowl favourites have only a slim chance of making the postseason.
The Ravens are now 4-11 playing without star QB Lamar Jackson, who was hurt, but the real issue is a historically bad defensive unit that is the primary concern - for a team that have been synonymous with stout defense over the years.
Houston coasted to victory as Baltimore became the first team in modern NFL history to concede a minimum of 37 points in four of their first five contests. Their season is already over.
Detroit's backfield tandem Gibbs and Montgomery scored a touchdown in the same game for the fourteenth occasion - a joint NFL record - as the Lions defeated the Cincinnati Bengals 37-24.
Victory made it four victories in a row for the highest-scoring team the Lions, but none against opponents with positive records.
A more surprising 4-1 team are the Indianapolis Colts. With Jonathan Taylor running in three touchdowns in their decisive hammering of Las Vegas and signal-caller Daniel Jones looking like a transformed player, they will be a difficult opponent for any team.
Tampa Bay joined the 4-1 club with a thrilling 38-35 victory in Seattle in which the sides traded nine touchdowns in 10 impressive drives before the Seahawks cracked first with a final-minute turnover.
Chase McLaughlin kicked the game-winner with the last kick of the contest for his second occasion this season. All four of the Bucs' wins have been clinched in the last minute.
Given how the New Orleans Saints and Tennessee began this campaign, they needed help to get their first wins, and they got plenty due to several comical errors from New York and Arizona.
After a strong opening from first-year player Jaxson Dart, the Giants made five turnovers - one was crucially returned for a touchdown - while additionally permitting Rashid Shaheed to find the end zone on an 87-yard catch and run as the Saints prevailed 26-14.
Arizona were even worse as they squandered a 21-3 lead mainly thanks to two huge blunders.
First, Emari Demercado unexplainably dropped the football moments before crossing the line for a 72-yard touchdown.
Worse followed when Arizona intercepted Cam Ward close to their end zone, then fumbled the ball into the end zone for Tyler Lockett to score as the Titans ended a ten-contest slide with a narrow victory.

The receiver registered among the most bizarre scores we'll see this season.
This left New York's Jets as the only winless team left in the NFL after their bruising 37-22 defeat by Dallas.
The quarterback became the first player in NFL history to surpass 4K through the air and 1K on the ground in his first 20 career games as he returned from injury to guide the Washington Commanders to a notable 27-10 win at the Los Angeles Chargers.
The running back was the star man for the Carolina Panthers with 206 rushing yards in their exciting 27-24 victory over Miami.
Minnesota Vikings 21-17 Cleveland Browns
Houston Texans 44-10 Baltimore Ravens
Miami Dolphins 24-27 Carolina Panthers
Las Vegas Raiders 6-40 Indianapolis Colts
New York Giants 14-26 New Orleans Saints
Dallas Cowboys 37-22 New York Jets
Denver Broncos 21-17 Philadelphia Eagles
Tennessee Titans 22-21 Arizona Cardinals
Tampa Bay Buccaneers 38-35 Seattle Seahawks
Detroit Lions 37-24 Cincinnati Bengals
Washington Commanders 27-10 Los Angeles Chargers
New England Patriots 23-20 Buffalo Bills
San Francisco 49ers 26-23 Los Angeles Rams (OT)
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