Invasor was Horse of the Year and champion older male in 2006 when he won the Pimlico Special, Suburban Handicap, Whitney Handicap, and Breeders' CupClassic.
Animal Kingdom, the 2011 Derby winner, and two-time Breeders' Cup Ladies Classic winner Royal Delta, along with Dullahan, will attempt to give American-based horses their first World Cup win since 2010, when the track was changed from dirt to a synthetic surface.