The first of two Sprint Cup test sessions at Las Vegas Motor Speedway finished with Jimmie Johnson, the winner at Atlanta on Sunday, atop the speed chart.
The four-time Las Vegas winner finished the session with a speed of 192.981 mph after 18 laps on the 1.5-mile track.
Defending race winner Kevin Harvick was 12th fastest. Rookie Chase Elliott (20th fastest) recorded the most track time with 45 laps. He was followed by fellow rookie Ryan Blaney and Vickers at 44 laps.
The second test session lasts three hours and begins at 3 p.m. ET.