Chargers Stunned by Cardinals in Week 1 Upset as Herbert, Offensive Line Struggle

The Los Angeles Chargers opened their 2026 season with a stunning collapse, falling 26-14 to the Arizona Cardinals at SoFi Stadium in what NFL observers are already calling the biggest upset of Week 1. Justin Herbert and a Chargers team many pegged as an AFC West favorite instead limped out of the gate 0-1, while Arizona’s backup-turned-starter Jacoby Brissett carved them up with a clean, mistake-free outing.

Herbert entered Sunday healthy and with a retooled offense under new play-caller Mike McDaniel, fueling expectations that 2026 would be his best season yet. Instead, the seventh-year quarterback completed just 17 of 27 passes for 209 yards with one touchdown and one interception, and Los Angeles’ running game never found any rhythm. The result immediately became one of the most searched storylines in sports on Sunday, with Herbert’s name trending alongside the Cardinals, Packers, Vikings and Eagles as Week 1 delivered chaos across the league.

How Arizona Pulled Off the Upset

Brissett, who took over after Kyler Murray’s offseason release and departure to Minnesota, was nearly flawless against a Chargers defense that had been considered one of the more improved units in the conference. He completed 27 of 37 passes for 277 yards and a touchdown without turning the ball over, leaning heavily on tight end Trey McBride, who caught nine passes for 95 yards and a score. Arizona also surprised many by making veteran Tyler Allgeier its primary ball carrier over rookie first-rounder Jeremiyah Love, who was managing a lingering ankle issue.

For the Chargers, the warning signs had been building for weeks. Los Angeles allowed a franchise-record 60 sacks a season ago and made offensive line reinforcement its top offseason priority, only to lose newly signed center Tyler Biadasz to a season-ending ACL injury during a joint practice with the 49ers in August. That left rookie Jake Slaughter as the starting center for the opener, and the shuffled front five struggled to consistently protect Herbert or open lanes for the run game.

Injuries Add to the Concern

Adding to a rough afternoon, wide receiver Ladd McConkey suffered a chest injury late in the game and headed to the locker room, leaving his status beyond Week 1 uncertain. Edge rusher Tuli Tuipulotu had been a game-time question all week with a hip issue after being limited in every practice session, while cornerback Deane Leonard was already ruled out with an abdomen injury heading into kickoff. Running back Keaton Mitchell and receiver Brenen Thompson, both dealing with minor ailments earlier in the week, were cleared to play but the offense still couldn’t generate consistent explosive plays.

Head coach Jim Harbaugh and McDaniel now face a quick turnaround to fix the issues that surfaced in Week 1, from protection breakdowns up front to a passing attack that looked out of sync for long stretches. Herbert, named a team captain for 2026 alongside safety Derwin James, will be under pressure to bounce back fast against a Chargers schedule that only gets tougher from here. Bettors already shifted their attention to Los Angeles’ next matchup, and with the line moving in response to Sunday’s result, anyone tracking the market will want to check the latest FanDuel promo code before placing a Week 2 wager on how the Chargers respond.

For a franchise many expected to contend deep into the postseason, an 0-1 start built on a defensive letdown and an offensive line still finding its footing is an uncomfortable early gut check. How Los Angeles answers in the coming weeks will go a long way toward determining whether Sunday’s loss was a one-off stumble or an early sign of deeper problems.