As he sits at the top of the board in Group 1 practice at Chicago, William Byron gets loose in Turn 9, slamming the outside ...

Stage 1 at the Chicago Street Course will end under the yellow flag as Brad Perez spins into the tire barrier in Turn 4.

See where your favorite NASCAR Xfinity Series driver will pit for Saturday's The Loop 110 at the Chicago Street Course (4:30 p.m. ET, The CW).