During the Cook Out Southern 500 at Darlington Raceway, Tyler Reddick of 23XI Racing struggled with severe stomach illness but managed to finish 10th, securing the NASCAR regular season championship. Reddick's condition, described as 'throwing up, sh***ing myself,' led his team to adjust their strategy by providing him with medication and sustenance during pit stops. Despite his discomfort, Reddick's perseverance allowed him to maintain a one-point lead over Kyle Larson. The race was emotionally intense for 23XI Racing co-owner Michael Jordan, who came down to pit lane to support his drivers, especially as Bubba Wallace narrowly missed the playoffs. Chase Briscoe won the race, securing a spot in the NASCAR Cup Series playoffs, while other drivers like Ty Gibbs and Martin Truex Jr. also clinched postseason spots.