Every week in the NFL, there's at least one unexpected upset. Some are as extreme as the Kansas City Chiefs beating the undefeated Green Bay Packers last season, and some aren't as surprising.
But for week one of the 2012 NFL season, there are several teams that are currently favored that could certainly lose and begin the season 0-1.
Here are a few currently favored teams that are on upset alert heading into week one:
Despite the uncertainty of whether or not star running back Adrian Peterson will even play on Sunday, the Minnesota Vikings are favored by four points over the Jacksonville Jaguars, according to Bovada.
The Jaguars are an underrated team that will make some noise this season, and Jacksonville's pass rush should dominate Minnesota's offensive line.
Rookie left tackle Matt Kalil struggled in the preseason for the Vikings, and his struggles could continue on Sunday against a talented Jaguars defense.
New York Jets
While the New York Jets' offense was horrid in the preseason, as the team didn't even score a touchdown until the final game—they are currently favored by three points over the up-and-coming Buffalo Bills.
The quarterback carousel in New York is heavily publicized and will have an affect on the outcome of Sunday's game. The team will try to use Tim Tebow in certain packages to complement starter Mark Sanchez, but in the end it will come back to haunt them.
With an improved pass rush and some continuity on offense, the Bills should win this game.
Currently favored by 1 1/2 points over the Pittsburgh Steelers, the Broncos could be on upset alert for Sunday night's prime time matchup. Despite beating the Steelers in the playoffs last year without Peyton Manning at quarterback, Pittsburgh is not a team to sleep on.
The Steelers still have one of the best defenses in the NFL, and if Rashard Mendenhall is cleared to play, the team's offense could put up some impressive numbers against the Broncos.
It will be tough without safety Ryan Clark (out due to a sickle cell trait), but the Steelers could still start the season 1-0.