Nick Giffen, AKA @RotoDoc has a Ph.D in mathematics, is a three-time qualifier for the DraftKings NASCAR Main Event. RotoDoc placed 1st, 3rd, 4th, 5th, and 7th in the $125k DFS tournament for The Clash at Daytona in 2017, one year after placing 1st, 2nd, and 3rd in the same event. In 2016, RotoDoc finished 8th out of over 20,000 entrants in the $400k DraftKings NASCAR Daytona 500 slate after being in 1st place going into the last lap. In 2017, RotoDoc finished in 8th place in the $300k Daytona 500 slate. Here are his NASCAR DFS picks and projections for the 2018 Daytona 500.