NASCAR's Sprint Cup points leader lost control of his No. 14 Chevrolet and spun off the tunnel turn at the end of Saturday's first practice. The car spun into the grass, sending mud and sod flying and ripped off the nose of his car.
His Stewart-Haas Racing crew quickly got to work on the backup. Stewart became the pole sitter for Sunday's Pocono 500 when rain washed out Friday's qualifying and start positions were based on the points.
Stewart was confident he could still make a strong run in the backup.
"I feel like it's better than the primary car," Stewart said.