Busch wrecks his Chevy

After posting the fastest speed in Friday's combined practice sessions for the Samsung 500, Kyle Busch wrecked his primary No. 5 Hendrick Motorsports Chevrolet just five minutes into the opening 50-minute Nextel Cup Series session Saturday morning at Texas Motor Speedway.

Busch, who would have started fifth on Sunday, will be forced to start at the rear of the field in his backup car. Although it was expected that Busch's backup car would be equipped to handle the new R07 Chevrolet engine that Busch was supposed to use this week, it is not, so he will use the current SB2 engine in the event.

Topping the speed chart was Joe Gibbs Racing's Tony Stewart – one of six drivers competing Sunday with the R07 engine – with a lap of 190.712 mph.