#19-Matt Tifft was fastest during opening practice at Kansas with a speed of 177.936mph.
The rest of the top 10: #22-Ryan Blaney, #20-Erik Jones, #2-Austin Dillon, #42-Tyler Reddick, #1-Elliott Sadler, #00-Cole Custer, #48-Brennan Poole, #7-Justin Allgaier, and #9-William Byron.
38 drivers practiced during the session.
See complete results on the Kansas practice 1 speeds page (pdf).
