Whether you're a weekly watcher or a casual Cup fan, this guide will get you up to speed on the drivers in the bracket.

NASCAR Cup Series begins its inaugural In-Season Challenge on Saturday, in which 32 drivers will compete in a head-to-head knockout bracket during five otherwise standard Cup Series events. Of the two teams that remain by the fifth race,

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