Photos: NASCAR at Darlington Raceway, Friday, Sept. 1, 2017

DARLINGTON, SC - SEPTEMBER 01: Keselowski, driver of the #2 Miller Genuine Draft Ford, and his crew chief Paul Wolfe look on during practice for the Monster Energy NASCAR Cup Series Bojangles' Southern 500 at Darlington Raceway on September 1, 2017 in Darlington, South Carolina. (Photo by Jerry Markland/Getty Images)