#62-Brendan Gaughan was fastest during opening practice at Las Vegas Motor Speedway with a speed of 182.568mph.
The rest of the top 10: #20-Daniel Suarez, #12-Joey Logano, #9-William Byron, #22-Brad Keselowski, #33-Brandon Jones, #18-Kyle Busch, #6-Darrell Wallace, Jr., #42-Kyle Larson, and #1-Elliott Sadler.
37 drivers practiced during the session.
See complete results on the Las Vegas practice 1 speeds page (pdf).
