NASCAR will head back to Daytona this weekend for the Sprint Cup Series Coke Zero 400 and the Nationwide Series Subway Firecracker 250. The Coke Zero 400 will be race No. 18 of the 36-race Sprint Cup season, and as the schedule hits the halfway mark there is still much to be decided. Jimmie Johnson leads the Sprint Cup standings, with three wins in 17 starts. Matt Kenseth is atop SB Nation's power rankings, however, after winning in Kentucky last weekend.