UPDATE: Last Sunday's NASCAR Cup Series Southern 500 from Darlington earned a 1.5 rating and 2.66 million viewers on NBCSN, down 17% in ratings and 14% in viewership from last year (1.8, 3.10M) and down 46% and 43% respectively from 2016 on the NBC broadcast network (2.8, 4.64M).
Brad Keselowski's win was the lowest rated and least-watched race at Darlington since at least 1999, including the 400-mile race that was discontinued in 2004.
It was also the lowest rated and least-watched Labor Day weekend race over the same span.
--- Sports Media Watch ---
Original post 9-4-2018:
Darlington TV ratings. https://twitter.com/A_S12/status/1037014788423991296— Adam Stern (@A_S12) September 4, 2018