 In the official International Classification he was rated thirteen pounds behind Alleged and eight pounds below the leading three-year-old Ile de Bourbon.In their book, "A Century of Champions", based on the Timeform rating system, John Randall and Tony Morris rated Julio Mariner an "inferior" winner of the St Leger.Julio Mariner was retired from racing to become a breeding stallion at the Ashley House Stud in Newmarket, with a syndication value of £800,000.