NASCAR’s top series is in Kentucky for the weekend. Starting tonight, the Kentucky Motor Speedway will host the NASCAR Sprint Cup Series.This weekend’s race ends a decade long struggle to get a major NASCAR race into the eleven-year-old track in Sparta, Kentucky.The one-and-a-half-mile track is hosting three national series races this weekend starting with the Nationwide series for trucks today and tomorrow and ending with the Quaker State 400 on Saturday night.