AI-assisted summary

Chase Briscoe dominated the Cook Out Southern 500 at Darlington Raceway, leading 309 laps and securing his spot in the second round of the NASCAR Cup Series playoffs.

Multiple playoff drivers struggled at Darlington, including Alex Bowman, Shane van Gisbergen, and Josh Berry.

Mr. Saturday did a whole lot of haulin' on Sunday.

Chase Briscoe , who just missed winning his seventh pole of the season on Aug. 30, controlled the Cook Out Southern 500 at Darlington Raceway on Aug. 31. He started second behind Denny Hamlin and led 309 laps on his way to Victory Lane.

The next closest driver to his laps-led total was John Hunter Nemechek with 15.

And his prize? Briscoe became the first driver to lock himself into the second round of the NASCAR Cup Series playoffs .

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