Mike LaFleur won his first game as a head coach, and in doing so he ended one of the quieter, sadder streaks in pro football: no full-time Cardinals coach had won his debut since Don Coryell did it in 1973. Arizona went into SoFi Stadium on Sunday afternoon and beat the Los Angeles Chargers 26-14. Fifty-three years of openers, and the Mike LaFleur Cardinals debut win is the one that finally broke it.

That is the kind of number that stops you mid-sip. Nineteen seventy-three. The franchise has moved from St. Louis to Phoenix to Arizona since then. It has hired Bud Wilkinson and Gene Stallings and Buddy Ryan and Denny Green and Ken Whisenhunt and Bruce Arians and Kliff Kingsbury and Jonathan Gannon, real football men, some of them very good ones, and not a single one of them got to walk off the field 1-0 with the job still new in their hands.

Who was the last Cardinals coach to win his debut?

Don Coryell, 1973, in St. Louis. And here is the part that makes an old notebook sing: the last man to win a Cardinals debut is the same man who later went to San Diego and built Air Coryell, the offense that taught the sport how to stretch a field vertically and never really stopped being copied. He got his gold jacket in 2023. The coaching family tree that produced Sunday's winner, Shanahan branch, McVay branch, the whole modern passing-game industry, traces a good chunk of its DNA back to that guy.

So the Cardinals broke a Coryell streak. Against the Chargers. At the Chargers' place. You could not script that any tighter.

What the Cardinals actually did to the Chargers

I do not have the full box in front of me yet, so I am not going to pretend I can tell you which drive turned it. What I can tell you is what 26-14 means on a day like Sunday. The Bears and Panthers combined for 96 points, the most ever in a season opener. Detroit and New Orleans went to overtime and needed 61 between them. The league spent the afternoon playing volleyball.

And in Inglewood, a first-time head coach held a playoff-caliber home team to 14. That is not a fluke script. That is not a team catching six turnovers and running away. Two touchdowns allowed in a dome, on a day when the rest of the sport could not stop anybody. That is a tell about what LaFleur wants his defense to be, and it is the most encouraging thing in the result, more than the scoreboard itself.

LaFleur came up calling plays for the Jets and then coordinating for the Rams, which means his reputation is offense. His first win came with a 14-point defensive performance underneath it. Coaches get defined early. This is a good early definition.

What comes next for LaFleur and the Chargers

For Arizona, the honest caution: it is one game, and Week 1 is the least reliable week on the calendar. Every year a team wins an opener nobody saw coming and every year about half of those teams are ordinary by Halloween. The thing to watch is whether the defensive front travels, and whether LaFleur's offense grows past a well-prepared season-opening plan into something that works when the tape is out and defenses know what is coming.

For the Chargers, this is the uncomfortable kind of Week 1. Not a blowout you can throw away, not a loss you can blame on a freak bounce. Fourteen points at home. Their problem is that the whole league saw it and will spend the week asking the same question about what is wrong in Los Angeles.

Next for me: whether Arizona's defense can put a second straight week of it on tape, and whether the Chargers' offense looks like the same group that could not get out of its own way at SoFi. One of those two answers is going to be the real story of these teams' Septembers.