This week's Cook Out Southern 500 at Darlington has some interesting opening lines at sportsbooks. We can use those lines to see who are good plays for NASCAR DFS on Sunday. Matt Selz breaks down why current betting lines on Aric Almirola, Kevin Harvick, William Byron, and Austin Dillon, last week's Daytona winner, make those drivers potentially very good picks and plays for DraftKings and FanDuel for Sunday's Darlington race.