#33-Matt Crafton was fastest during opening practice at Las Vegas Motor Speedway with a speed of 177.637mph. #54-Kyle Busch was second, followed by: #3-Ty Dillon, #42-Kyle Larson, #9-Chase Elliott, #2-Brian Scott, #88-Dale Earnhardt, Jr., #20-Matt Kenseth, #22-Brad Keselowski, and #6-Trevor Bayne. 40 drivers practiced during the session. See complete results on the Las Vegas practice 1 speeds page (pdf).
