#18-Denny Hamlin was fastest during opening practice at Darlington with a speed of 170.608mph.
The rest of the top 10: #42-Tyler Reddick, #7-Justin Allgaier, #1-Elliott Sadler, #9-William Byron, #00-Cole Custer, #48-Brennan Poole, #22-Joey Logano, #96-Ben Kennedy, and #20-Erik Jones.
38 drivers practiced during the session.
See complete results on the Darlington practice 1 speeds page (pdf).
