Kyle Busch began his weekend at Pocono Raceway by posting the top speed in the first Cup practice session.
Busch recorded a top speed of 176.939 mph around the speedway. He made five laps in the session.
Kurt Busch was sixth fastest, giving Stewart-Haas Racing three cars in the top five.
Cole Custer, who is making his second Cup start, recorded the most laps with 19. He was 30th on the speed chart.