Giant's Causeway earned himself the name of 'Iron Horse' during the summer of 2000. It was a well-earned name as he slugged it out head to head with a number of that year's top horses. It was his determination not to be beaten that marked Giant's Causeway ahead of the rest and led to a remarkable five successive group one winners. His victories were in the St James's Palace Stakes - by a head, the Eclipse - by a head, the Sussex Stakes - by a comfortable three quarters of a length, the International Stakes by a head and the Irish Champion Stakes - by half a length. On top of all this he also managed credible second places in the English and Irish 2000 Guineas, the Queen Elizabeth II Stakes, where he was beaten by half a length and the Breeders' Cup Classic where he was beaten by no more than a neck.

The distances involved don't always tell the whole story of the titanic battles that Giant's Causeway was involved in, especially his two victories over the unfortunate Kalanisi. Giant's Causeway battled like few other horses have in the history of the sport and fully deserves his place in racing's Hall of Fame.