Austin Dillon enters this weekend's Cook Out 400 as the defending winner after earning one of the biggest victories of the 2025 NASCAR Cup Series season at Richmond Raceway. AdvertisementAdvertisement AdvertisementHere's a look back at last year's Richmond race and what it could mean entering Saturday night's return to the Virginia short track. AdvertisementAdvertisement AdvertisementFollowing the win, Dillon credited both his team and his grandfather, NASCAR Hall of Famer Richard Childress. The victory also dramatically reshaped the Chase picture by giving Dillon an automatic berth with only one regular-season race remaining. Whether Dillon can defend his Richmond victory remains to be seen, but his 2025 triumph ensures he'll arrive this weekend as the driver everyone else is chasing.