NASCAR on Thursday will launch its first-ever Substack newsletter, becoming the first major sports league to partner with the email platform, NASCAR chief digital officer Tim Clark told Axios. Why it matters: It's part of a broader effort by the league to provide younger fans with a closer connection to drivers and their stories off the racetrack.

Welcome to Racing America On SI's live NASCAR race updates post for Sunday night's NASCAR Cup Series Cook Out Southern 500 at Darlington Raceway. This post will