#2-Brian Scott was fastest during opening practice at Dover Speedway with a speed of 153.191mph. #33-Cale Conley was second, followed by: #9-Chase Elliott, #42-Kyle Larson, #54-Kyle Busch, #62-Brendan Gaughan, #22-Joey Logano, #6-Trevor Bayne, #3-Ty Dillon, and #7-Regan Smith. 39 drivers practiced during the session. See complete results on the Dover practice 1 speeds page (pdf).
