The New England Patriots are favored to win every game this season, according to ESPN's Football Power Index. Still, the Patriots will have their work cut out for them. Five teams -- the Raiders, Steelers, Seahawks, Packers and Falcons -- pose the greatest threat to dethroning the five-time Super Bowl champions. Here's a closer look at each team and why they could knock off the Patriots.
Regular-season matchup: at New England, 8:30 p.m. ET, Sunday, Oct. 22
FPI chance to beat Patriots: 27.