Busch sped past Harvick's Chevy on the outside and suddenly turned right in front of him. Harvick hit Busch's Ford and spun it around.
Busch slid into his jackman, who was treated at the track hospital and released.
Green, who lost by 0.142-second -- also about two car-lengths -- was followed across the finish line by Rudd, two-time Daytona 500 winner Sterling Marlin, Jeff Burton, three-time Daytona winner Dale Jarrett and two-time 500 champion Jeff Gordon.
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