Tyler Reddick’s next NASCAR road-course weekend now carries a sharper edge than the bracket sheet alone can show.
The Cup Series heads from Naval Base Coronado to Sonoma Raceway, where the 2026 In-Season Challenge begins on Sunday, June 28. NASCAR’s five-race, 32-driver knockout format starts with Reddick as the No. 1 seed, but San Diego has changed the feel of that opener. What looked like a clean launch into the tournament now comes after a costly late defeat, a flat tyre, and a regular-season lead that suddenly looks far less comfortable.
Reddick will open the Challenge against Alex Bowman at Sonoma, with the driver finishing higher in each head-to-head matchup advancing. NASCAR’s official format guide confirms the tournament will run through Sonoma, Chicagoland, EchoPark Speedway, North Wilkesboro and Indianapolis, with $1 million waiting for the eventual winner.
San Diego changed Reddick’s Sonoma reset
Reddick appeared to have San Diego under control late before Corey Heim closed in, forced the issue, and turned 23XI Racing’s afternoon into something far more complicated. Heim’s breakthrough Cup win has already been confirmed in Read Motorsport’s San Diego race report, but the bigger aftershock for Reddick is that he now arrives at Sonoma needing to steady two fights at once.
One is the bracket, where seeding gives him the cleanest theoretical route but no real margin once the green flag drops. The other is the Cup standings, after his lead over Denny Hamlin shrank to eight points on a day that could have strengthened his regular-season grip.
That combination makes Sonoma more than a standalone road-course race. Reddick has been one of the most complete Cup drivers of the season, but his San Diego finish was the kind of moment that can linger if the next weekend starts badly.
Sonoma puts the road-course specialists on notice
Sonoma Raceway has confirmed the Challenge opener will begin at 3:30 p.m. ET on TNT Sports, HBO Max, PRN Radio and SiriusXM NASCAR Radio. The venue also noted that this year’s bracket was set after Pocono, with Reddick leading the field ahead of Hamlin, Ryan Blaney, Chase Elliott and Ty Gibbs.
For Reddick, the Bowman matchup is dangerous because Sonoma rarely rewards a passive approach. Track position, pit timing and restart discipline can all decide the day before raw pace has time to show itself. Reddick does not need to win the Toyota/Save Mart 350 to keep the bracket alive, but he does need to beat Bowman while also avoiding another points hit.
The timing is just as important for the rest of the field. A.J. Allmendinger left San Diego with a result that improved his Chase picture, and Read Motorsport’s post-race look at his top-five run underlined how quickly a road-course weekend can reshape a season. Sonoma offers that same kind of leverage, only now with an elimination bracket layered on top.
The bracket starts with real pressure
The In-Season Challenge is designed to create clean, visible jeopardy inside the regular Cup calendar, but this opener lands at a moment when the main championship fight already has tension. Hamlin’s side of the draw begins against Ty Dillon, and he cannot meet Reddick until the final, but every Reddick slip still matters in the points table.
That is what gives Sonoma its weight. Reddick arrives as the top seed, the regular-season leader and the driver with the most obvious chance to turn the Challenge into another statement. He also arrives having just watched a certain San Diego win disappear into a 25th-place finish.
For a driver who has controlled so much of NASCAR’s season, Sonoma is the first test of how quickly he can make San Diego feel like an interruption rather than a turning point.
