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The four-year-old Montjeu gelding followed up two second-place efforts with a deserved maiden victory at the third attempt.
Trainer David Simcock's charge was a 5/2 shot for the extended 11-furlong contest and travelled for much of it in mid-division.
With a quarter of a mile to go, jockey Jamie Spencer got to serious work and Red Cardinal responded to lead approaching the furlong marker.
Mawaany threw down a late challenge but the Trillium Place representative showed good resolve to hold on for a neck triumph.