Kyle Busch topped the speed chart in the Xfinity Series’ first practice session for Saturday’s race on NBC.
Busch put up a speed of 167.379 mph during his 19 laps around Darlington Raceway.
Busch’s Joe Gibbs Racing teammate Denny Hamlin was second fastest at 167.015 mph.
The top five was filled out by Paul Menard (166.304), Joey Logano (166.034) and Ty Dillon (165.788).
Dillon was in the top five despite having earned a “Darlington stripe” very early in the session, along with Darrell Wallace Jr.