Speedway Motorsports Inc. has agreed to purchase Kentucky Speedway, opening the door for the northern Kentucky track to perhaps one day host a NASCAR Sprint Cup Series event.

The deal announced Thursday by SMI chairman Bruton Smith could end a lengthy battle between the track's ownership group and NASCAR. The 1.5-mile oval, located in Sparta, Ky., midway between Cincinnati and Louisville, opened in 2000 and hosts several circuits a year, including the Nationwide Series and the Indy Racing League.

Kentucky Speedway filed an antitrust lawsuit in 2005 against NASCAR and International Speedway Inc. The lawsuit was dismissed in January.

SMI, which operates several other tracks that host Sprint Cup events, could move one of those races to Kentucky Speedway.