Every NFL season kicks off with a carefully curated slate of marquee matchups, but as any seasoned fan knows, the biggest surprises often come from the games no one saw coming. Remember when the Patriots stunned the Bengals in 2024? That's the kind of Week 1 magic that keeps us glued to our seats—and it could happen again this fall.

With the full 2026 NFL schedule now released, we've identified three matchups that look lopsided on paper but carry serious upset potential. From the hallowed turf of Arrowhead Stadium to the bright lights of SoFi, these are the games where underdogs could roar. Let's break down each one and rate their upset potential on a scale from 1 to 10.

First up, there's the clash at Highmark Stadium in Buffalo—a venue that's become a fortress for the Bills. But even the most dominant home teams can be caught off guard in Week 1, especially when facing a hungry opponent with something to prove. Then there's Allegiant Stadium in Las Vegas, where the Raiders have built a reputation for pulling off stunners under the desert lights. And don't overlook Mercedes-Benz Stadium in Atlanta, a modern marvel that's seen its share of early-season drama since opening in 2017.

Other stadiums hosting potential upset games include SoFi Stadium (home of the Chargers and Rams), U.S. Bank Stadium in Minnesota, and Levi's Stadium in San Francisco. Even seasoned venues like Arrowhead Stadium (opened in 1972) and Caesars Superdome (opened in 1975) can't be ruled out—history shows that even the most established teams can stumble in Week 1.

Whether you're gearing up for game day in your favorite team's gear or just love the thrill of an unexpected victory, these matchups are ones to watch. After all, the beauty of NFL Week 1 is that anything can happen—and that's exactly why we love it.