This Saturday, Aiden O'Brien's unbeaten colt Camelot will be aiming to add the Irish Derby to his Epsom Derby victory from earlier this month. It's a neat double, achieved by only 15 horses before him. But his trainer has his eye on another prize. Camelot has already captured the English 2,000 Guineas and the Epsom Derby. Assuming everything goes to plan this weekend, his next target will be the St. Ledger Stakes at Doncaster in September -- and racing immortality.