NFL’s five remaining unbeaten teams all have spun straw into quarterback gold

Three weeks into the NFL season, and five teams are undefeated: Philadelphia, Minnesota, New England, Baltimore and Denver.

These franchises all have something in common besides their 3-0 records. They all bent a giant quarterback question mark into an exclamation point.

While the Eagles are enjoying the rapid emergence of rookie Carson Wentz, the player they got rid of, Sam Bradford, has been an unlikely hero for the injury-ravaged Vikings.

The Patriots have won with both Jimmy Garoppolo and rookie Jacoby Brissett as they wait out the four-game suspension of Tom Brady. The Ravens’ Joe Flacco is 10 months removed from a season-ending knee injury.

Denver, meanwhile, is the first defending Super Bowl champion since Baltimore in 2001 to switch starting quarterbacks in the off-season. Peyton Manning retired, Brock Osweiler signed with Houston, and the untested Trevor Siemian — a second-year player who had never taken an NFL snap — took over the starting job.

The Broncos posted a 29-17 victory at Cincinnati on Sunday, and Siemian became the first player in league history to pass for at least 300 yards and four touchdowns without an interception in his first career road start.

“Obviously going in, no one knew about him,” Denver receiver Emmanuel Sanders said. “But now everybody started talking about it.”

So what will people be talking about when it comes to Week 4 games?

Thoughts on some of the more interesting matchups:

Indianapolis vs. Jacksonville in London — This doesn’t promise to be a great game between the 1-2 Colts and 0-3 Jaguars, but there’s a chance it’s the last game for Jacksonville Coach Gus Bradley, who is 12-39 in three-plus seasons. Jaguars owner Shahid Khan is particularly interested in engaging the London market, where his team could wind up one day. And the London game has been the Waterloo of other embattled coaches, in part because there’s that long flight home and the built-in week off after the trip. Oakland fired Dennis Allen in the immediate aftermath of a London loss, and Miami fired Joe Philbin after a London loss, too.

Oakland at Baltimore — With impressive wins at New Orleans and Tennessee, the Raiders are 2-0 on the road for the first time since 2002, when they made it to the Super Bowl. Raiders Coach Jack Del Rio won a Super Bowl ring as linebackers coach of the Ravens in the 2000 season. His Raiders are 4-1 in their last five road games, dating to last November.

Seattle at New York Jets — While Seattle quarterback Russell Wilson tries to bounce back from a knee sprain, the Jets’ Ryan Fitzpatrick looks to recover from an ego sprain, coming off his six-interception performance Sunday in a 24-3 home loss to Kansas City. The Seahawks make their first return to MetLife Stadium since rolling Denver there in the Super Bowl in early 2014. It’s worth noting the Jets were the first team to hire Pete Carroll as head coach. He’s hoping that return works out better than his Coliseum homecoming in Week 2.

Cleveland at Washington — When the schedule came out, this was Redskins vs. RGIII, their old quarterback. Now, it’s Redskins vs. QBIII, as the winless Browns have peeled through Robert Griffin III and Josh McCown and, on Sunday, started rookie Cody Kessler. Not everything is dire in Cleveland. The Browns made a good showing in their 30-24 overtime loss to Miami.

Buffalo at New England — Bills Coach Rex Ryan was on the hot seat, but his world looks different after beating Arizona on Sunday. This might be his best chance to beat Bill Belichick, considering the banged-up condition of Patriots quarterbacks not named Brady. Buffalo won at New England two years ago, but otherwise hasn’t had much luck against the Patriots of late. The Bills have won just two of the last 25 games in the series.

Rams at Arizona — After starting 1-2 for four consecutive seasons under Jeff Fisher, the Rams are finally 2-1. The Cardinals are coming off a bad loss at Buffalo. Arizona lost just three regular-season games in 2015, and one of those was at home to the Rams. Should be a good matchup between two onetime St. Louis franchises.

Dallas at San Francisco — Each of these crown-jewel franchises has won five Super Bowls. That doesn’t have a ton of relevance to the participants this year, though. For instance, Dallas rookie running back Ezekiel Elliott was born six months after the 49ers won their most recent Lombardi Trophy, and six months before the Cowboys won their most recent one.

Denver at Tampa Bay — This game features the unlikely matchup of Tampa Bay’s Jameis Winston and Denver’s Siemian, even though they won’t be on the field at the same time. Winston was the No. 1 overall pick in the 2015 draft and Siemian, a seventh-round pick taken 250th, was the last quarterback taken. If Winston loses, though, it’s he who will be more in danger of becoming Mr. Irrelevant.

sam.farmer@latimes.com

Twitter: @LATimesfarmer