DARLINGTON, S.C. - Kurt Busch recorded the fastest lap in the first of two Cup practice sessions Friday at Darlington Raceway.
Busch had a top lap of 171.261 mph. He was followed by William Byron (170.702 mph), Aric Almirola (170.065), Alex Bowman (169.988) and Jimmie Johnson (169.660).
Busch also ran the most laps in the session at 34.
William Byron had the best average over 10 consecutive laps at 167.183 mph. He was followed by Kyle Busch (166.928 mph) and Bowman (166.721).
MORE: Click here for practice report
Final Cup practice will be from 4:05 - 4:55 p.m. ET on NBCSN.
Cup qualifying will be at 2:05 p.m. ET Saturday on NBCSN. The race will be at 6 p.m. ET Sunday on NBCSN.