NASCAR’s Newest Street Course Delivered Instant Chaos Before the Weekend Was Even Over

NASCAR’s first national-series race weekend on the streets of San Diego was always going to be unpredictable.

Few could have imagined it would be this chaotic.

Before Saturday’s O’Reilly Auto Parts Series race at Naval Base Coronado reached the checkered flag, officials had already dealt with a loose manhole cover, two lengthy red flags, a damaged retaining wall, and a massive 23-car pileup that wiped out much of the field. By the end of the afternoon, the conversation wasn’t centered on who won the race. It was about whether NASCAR’s newest venue had just produced one of the wildest races of the season.

For a series that prides itself on close racing and unpredictability, San Diego delivered both in abundance.

The Race Was Stopped Before the Field Even Completed a Lap

The first major incident of the afternoon came before the 37-car field could finish its opening lap.

During the United Rentals Drive to Serve 250, a manhole cover that had been welded shut came loose and slammed into the front of Corey Day’s Chevrolet, destroying the radiator and forcing NASCAR to throw a red flag.

Track workers spent more than 18 minutes repairing the cover before the race could continue. NASCAR later allowed Day’s team to repair the damage under the red flag and eventually gave him the opportunity to make up the laps he lost while stranded on pit road.

Remarkably, Day recovered to finish 10th.

At the time, it appeared that would be the story of the race.

It wasn’t even close.

A Restart Triggered a Massive 23-Car Wreck

The defining moment of the afternoon came on Lap 35.

As the field charged into Turn 2 following a restart, Sam Mayer drifted too close to the right-side wall. His car made contact, shot back across the racing surface, and triggered a chain-reaction crash that quickly collected competitors throughout the pack.

Cars piled into one another as drivers had nowhere to go on the narrow street-course layout. When the dust settled, more than half the field had sustained damage.

The impact was severe enough that NASCAR immediately displayed a second red flag while safety crews responded and workers assessed damage to the retaining wall.

Mayer accepted responsibility afterward.

“I just want to say sorry to everybody in the field,” Mayer said. “I’m looking at the people who are involved in the crash and it’s literally everybody. Sorry to all the people that have to put work in now because of my mistake. I’m going to have to go around the whole garage and apologize and that’s never a fun feeling.”

He later explained that limited visibility entering the corner and an aggressive push on the restart contributed to the mistake.

More Than Half the Field Was Swept Up in the Chaos

The wreck’s reach was staggering.

Among those caught in the incident were Anthony Alfredo, Justin Allgaier, Sammy Smith, Brandon Jones, Ryan Sieg, Rajah Caruth, Brennan Poole, Austin Green, Leland Honeyman Jr., Blaine Perkins, Dean Thompson, Harrison Burton, Jeremy Clements, Alex Labbe, Preston Pardus and several others.

Alfredo said the crash knocked the breath out of him and left both of his legs sore.

The damage wasn’t limited to race cars.

Workers spent 43 minutes and 10 seconds repairing the wall before the race could resume, creating one of the longest interruptions seen in the series this season.

San Diego’s Street Course Has Already Proven Itself Unforgiving

Street racing has become one of NASCAR’s most polarizing experiments.

Supporters point to the unpredictability, the unique scenery and the challenge of putting stock cars in places they were never designed to race. Critics point to the narrow confines, limited runoff areas and heightened potential for chaos.

Saturday’s O’Reilly Auto Parts Series race provided evidence for both arguments.

Before the event was over, the race had produced two red flags, extensive repairs to both the racing surface and retaining wall, and a 23-car crash that instantly became one of the largest incidents of the 2026 season.

The Cup Series still has its turn on the San Diego street circuit.

If Saturday was any indication, drivers may already be expecting a long afternoon.