BRISTOL, Tenn. -- Greg Biffle was forced to give his ride in Saturday's Nationwide Series race to Roush Fenway Racing teammate Matt Kenseth, a result of a rib injury he suffered in a boating accident earlier this week.
Biffle bruised his ribs during a Tuesday night fishing trip on Lake Norman in Charlotte, N.C. He slipped trying to jump from the dock onto the boat, turned sideways and came down with all of his weight on his side.
"Matt and I were fighting over this race to see who was going to get to run it," Biffle said Friday at Bristol Motor Speedway. "We're just going to swap Daytona or something like that so we keep the same amount of races.
"I'm disappointed, trust me, [because] I'm not running the Nationwide race. ... It was just a stupid deal."
While he says he feels fit enough to drive in the race, Biffle did not want to risk further injury, which could have possibly affected his ability to drive in Sunday's Sprint Cup race.
"You know how easy it is to get in a chain reaction [crash] here," Biffle said. "Why be even more sore for Sunday if something happens?"
David Newton covers NASCAR for ESPN.com. He can be reached at firstname.lastname@example.org.