Jason Dufner leads the RBC Heritage by one shot after three rounds, but he might not want to start thinking about how he would spend the winner's check just yet. Each of the previous four winners at Hilton Head was at least three shots back going into the final round. That's just one of the things You Oughta Know about what's happening at Harbour Town.
* Here's where each of the previous four winners stood after 54 holes: 2016: Branden Grace was three shots back. 2015: Jim Furyk was four shots back.