Daniel Suarez topped the leaderboard in Saturday's first Monster Energy NASCAR Cup Series practice at Charlotte Motor Speedway at 182.143 mph in the No. 41 Stewart-Haas Racing Ford.
Right behind him was defending Coca-Cola 600 winner Kyle Busch in the No. 18 Joe Gibbs Racing Toyota at 182.051 mph.
MORE: Full practice results | Best 10-lap averages | Updated odds for Charlotte
Rounding out the top five were Austin Dillon in the No. 3 Richard Childress Racing (181.488 mph), Ryan Blaney in the No. 12 Team Penske Ford (181.397 mph) and Kevin Harvick in the No. 4 SHR Ford (181.366 mph).
Series points leader Joey Logano was 14th fastest with a speed of 180.832 mph in the No. 22 Team Penske Ford. Pole sitter William Byron was 23rd in the session with a fast lap of 179.742 mph.
Fresh off a $1 million win in the All-Star Race, Kyle Larson placed 25th on the leaderboard at 179.665 mph.
The next practice session is at 11:05 a.m. ET on FS1. The series races Sunday at Charlotte in the Coca-Cola 600 (6 p.m. ET, FOX, PRN, SiriusXM NASCAR Radio).