Busch and Harry Gant are the only drivers to have swept consecutive NASCAR weekends, a feat Gant accomplished in 1991 at Richmond and Dover. No driver has ever swept three consecutive NASCAR weekends -- yet...."
http://www.upi.com/Sports_News/2016/04/16/Notebook-Kyle-Busch-looking-for-record-third-straight-sweep/2291460810904/
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