Fans watch the start of the STP 500 NASCAR Sprint Cup series auto race at Martinsville Speedway in Martinsville, Va., Sunday April 7, 2013. (AP Photo/Steve Helber)

Associated Press
Fans watch the start of the STP 500 NASCAR Sprint Cup series auto race at Martinsville Speedway in Martinsville, Va., Sunday April 7, 2013. (AP Photo/Steve Helber)
Fans watch the start of the STP 500 NASCAR Sprint Cup series auto race at Martinsville Speedway in Martinsville, Va., Sunday April 7, 2013. (AP Photo/Steve Helber)
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