NASCAR on NBC has appointed Leigh Diffey as the new lead play-by-play announcer for the Cup Series, starting with the Coke Zero Sugar 400 at Daytona International Speedway on August 24, 2024. Diffey, who recently served as the lead commentator for NBC Sports' Olympic track and field coverage, replaces Rick Allen, who will continue to commentate for the Xfinity Series. This change is significant as it comes during a crucial period in the NASCAR season, including the playoffs and championship race. Kevin Lee will take over Diffey's previous IndyCar duties as he transitions into his new role. Diffey expressed excitement about returning to motorsports, having covered various major racing events throughout his career, and aims to bring a fresh perspective to the NASCAR broadcasts. This move reflects a broader restructuring of NBC's motorsports coverage amidst upcoming changes in media rights for NASCAR.