An 18-car crash had a huge impact on the inaugural NASCAR In-Season Challenge, collecting the top two seeds and several other contenders in the five-race bracket for $1 million. The wreck appeared to begin shortly after a Lap 69 restart with contact between Denny Hamlin,

Thirty-two drivers, five tracks, one bracket -- and $1 million on the line. The new In-Season Challenge adds a layer to an already unpredictable portion of the Cup Series schedule. Spanning everything from drafting duels at Atlanta to the tight turns of Chicago and Sonoma

The Cup Series race at Atlanta this weekend kicks off NASCAR's inaugural in-season tournament. Here's what to know.