Crews try to dry the track after a rain shower before a NASCAR Cup Series auto race Sunday, Sept. 1, 2019, at Darlington Raceway in Darlington, S.C. (AP Photo/Richard Shiro)

Kyle Busch signs an autograph before practice for a NASCAR auto race on Friday, Aug. 30, 2019, in Darlington, S.C.. (AP Photo/Terry Renna)

FILE - In this Sept. 2, 2018, file photo, Brad Keselowski celebrates in Victory Lane after winning the NASCAR Cup Series auto race at Darlington Raceway, in Darlington, S.C. Keselowski can't wait to get to Darlington Raceway _ and it's not just because he swept race weekend the last time NASCAR's best showed up. This the fifth year the Southern 500 is NASCAR's throwback weekend, kind of an Old Timer's Day for fans and competitors to honor and mimic the greats of the past.(AP Photo/Terry Renna, File)

ADD HAMLIN STRIPPED OF WIN - Denny Hamlin holds up his trophy in Victory Lane after winning a NASCAR Xfinity Series auto race on Saturday, Aug. 31, 2019, at Darlington Raceway in Darlington, S.C. Hamlin was stripped of his win after he failed post-race inspection. Cole Custer was declared the winner. (AP Photo/Terry Renna)

NASCAR fans wait out a rain delay before the start of a NASCAR Cup Series auto race on Sunday, Sept. 1, 2019, at Darlington Raceway in Darlington, S.C. (AP Photo/Richard Shiro)

Denny Hamlin (11) races ahead of Daniel Suarez (41) during a NASCAR Cup Series auto race on Sunday, Sept. 1, 2019, at Darlington Raceway in Darlington, S.C. (AP Photo/Richard Shiro)

Jimmie Johnson (48) drives out of Turn 1 during a NASCAR Cup Series auto race on Sunday, Sept. 1, 2019, at Darlington Raceway in Darlington, S.C. (AP Photo/Richard Shiro)