NASCAR O'Reilly Auto Parts Series

The NASCAR O'Reilly Auto Parts Series, set to debut under this new title sponsorship in 2026, is NASCAR's crucial second-tier national division. Historically known as the Xfinity Series (2015-2025), Nationwide Series (2008-2014), and most famously the Busch Grand National Series (1984-2007), it has consistently served as the primary proving ground for aspiring Cup Series drivers. This championship provides a vital stepping stone, allowing emerging talents to hone their skills against a competitive field that often includes established Cup Series stars and seasoned series veterans, making for thrilling and unpredictable racing. Races in the O'Reilly Auto Parts Series typically run on Saturdays, preceding the Cup Series events at the same tracks, offering fans a full weekend of NASCAR action. The cars are purpose-built stock cars, slightly less powerful and aerodynamically complex than their Cup Series counterparts, but still capable of incredible speeds and close-quarters racing. The championship employs a familiar NASCAR points system, featuring stage racing where points are awarded at predetermined intervals within a race, culminating in a playoff format. A field of eligible drivers competes through several elimination rounds, with the final four battling for the championship in a winner-take-all season finale. Over its storied history, the series has been a launchpad for numerous NASCAR legends and champions, including Martin Truex Jr., Kyle Busch, Chase Elliott, and William Byron, all of whom honed their craft here before achieving success in the Cup Series. It continues to be a hotbed of talent, showcasing the future stars of the sport alongside fierce competition from drivers dedicated to winning this prestigious title. The entire series, from its technical regulations to its race operations, is governed and sanctioned by the National Association for Stock Auto Racing (NASCAR), ensuring consistent rules and high standards across all events.