NASCAR O'Reilly Auto Parts Series Race brings the fast, fender-to-fender action of stock car racing to Circuit of The Americas in Austin. The O'Reilly Auto Parts Series is NASCAR's developmental series, where rising drivers battle for position on the track. Circuit of The Americas is a purpose-built road course with dramatic elevation changes and sweeping turns, which makes for an exciting place to watch cars roar by. Bring sunscreen, a hat and your loudest race-day energy.