The Gatorade Duel, is NASCAR Sprint Cup preliminary event to the Daytona 500 held annually in February at Daytona International Speedway. It consists of two 150-mile races, and serves as a qualifying race for the Daytona 500. The finishing order in the two 150-mile races, held on Thursday, determine the starting lineup for the Daytona 500 held on Sunday.
Qualifying for the Daytona 500 is unique in NASCAR. Only the two front row starters (the pole position and "outside pole") are determined by the ordinary qualifying process of timed laps. After the top two positions are locked in, the rest of the starting grid is set by the finishing order of these two races. Drivers participate in one of the two races. Half the field entered for the Daytona 500 races in the first race, and the other half the second. The finishing order of the first race fills the odd positions of the starting grid (inside of each row), and the finishing order for the second race fills the even positions of the starting grid (outside of each row).
