A rough week for Marcos Ambrose got even worse Friday afternoon, as the Richard Petty Motorsports driver suffered a flat right front tire in opening practice.
The driver of the No. 9 Ford was slowing to hit pit road when he locked up the right front and flat-spotted the tire, causing it to blow.
While Ambrose was able to avoid contact with the wall or another car, there was enough damage to force the team to pull out the back-up car ahead of Friday’s final practice. Since the team was able to put the primary engine in the back-up car, Ambrose will be able to maintain his qualifying position following Saturday’s knockout session.