In Thursday's afternoon test session, Daytona 500 winner Denny Hamlin hit the wall and damaged his No. 11 Joe Gibbs Racing Toyota beyond repair.
Enter a backup car, the chassis that was supposed to serve as Hamlin's backup at both Las Vegas and, two weeks hence, at Auto Club Speedway in Fontana, Calif.
In Friday's opening NASCAR Sprint Cup Series practice at Las Vegas Motor Speedway, Hamlin ran seven laps in the backup, posting the 13th-fastest speed (193.778 mph) of the session.
Brad Keselowski topped the speed chart with a lightning-quick lap at 195.327 mph as drivers prepared for the qualifying session later in the day