Although produced by TNT Sports, the original idea of the NASCAR In-Season Challenge came from Joe Gibbs Racing veteran Denny Hamlin, who first proposed a March Madness-style bracket on his Actions Detrimental podcast in 2023. After a mixed reception in its debut year, the 2026 edition has generated far greater interest heading into Sunday's semifinal round at North Wilkesboro Speedway.
Introduced in 2025 and now in its second season, the five-race, single-elimination tournament awards a $1 million bonus to the winner while running alongside the regular NASCAR Cup Series championship. It has quickly evolved from an experimental concept into one of the sport's biggest summer storylines.
Instead of changing the championship system, Hamlin suggested creating a separate knockout competition where drivers would advance by finishing ahead of their assigned opponent each week. NASCAR adopted a version of that format when TNT Sports returned as a broadcaster in 2025, giving the network a unique storyline to follow during its five-race stretch.
Speaking about the tournament's progress, TNT Sports Executive Vice President and Chief Content Officer Craig Barry explained why the concept has connected better in its second season.
Barry stressed that the bracket was never intended to replace the race itself:
According to Barry, one particular factor appears to have made a noticeable difference this year:
The winner receives a $1 million bonus. It gives drivers an additional prize to chase while offering broadcasters another narrative throughout the race. Barry believes the format also fits NASCAR better than many other sports because every competitor races at the same venue on the same day.
Last year's championship round between Ty Gibbs and surprise finalist Ty Dillon failed to capture widespread attention despite Dillon's Cinderella run from the No. 32 seed. Much of the bracket was thrown into chaos after a massive 22-car crash in the opening race at Atlanta eliminated several top contenders, drawing heavy criticism from multiple insiders, including Denny Hamlin.
The major stars remain alive this season. Six of the top 12 seeds entered Round 3 at EchoPark Speedway, helping maintain interest deeper into the competition. NASCAR also shifted the opening round from Atlanta's drafting-style racing to Sonoma Raceway, reducing the role of luck in deciding early matchups.
Denny Hamlin himself noticed the difference after the Sonoma opener:
Ironically, Denny Hamlin avoided another early upset after Ty Dillon suffered mechanical trouble at Sonoma, only to be eliminated himself one round later at Atlanta.
The 2026 In-Season Challenge is now down to four drivers ahead of Sunday's points-paying Cup race at North Wilkesboro Speedway. No. 3 seed Ryan Blaney advanced after defeating No. 11 seed William Byron at Atlanta, while No. 10 seed Christopher Bell eliminated his Joe Gibbs Racing teammate, No. 2 seed Denny Hamlin.
On the other side of the bracket, No. 4 seed Chase Elliott knocked out No. 12 seed Chase Briscoe, while No. 25 seed Todd Gilliland continued his surprise run by beating No. 32 seed Alex Bowman to become this year's Cinderella story.
Denny Hamlin had earlier correctly predicted three of the four semifinalists. Looking ahead to the Bell-Blaney matchup at North Wilkesboro, he said it had all the ingredients of a championship-caliber battle in the latest Actions Detrimental (37:55 onwards):
Denny Hamlin also picked Chase Elliott to defeat Todd Gilliland in the other semifinal, setting up a Bell-Elliott championship showdown for next week's Brickyard 400 at Indianapolis Motor Speedway.
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