The other reason to pay attention is the stable this two-year-old calls home. Aidan O'Brien's yard in Cashel, County Tipperary, has sent out 144 winners already this season — a number that tells you everything about the scale and quality of the operation. This is one of the most powerful training yards in the world, responsible for a remarkable number of the biggest races in Britain and Ireland. When a yard like this bothers to run a horse on debut, it rarely does so without good reason.
Whether Sergei Diaghilev lives up to the billing is something only the racecourse will decide. Debut runners are the ultimate unknown quantity. But the combination of top-drawer breeding and one of the finest training operations on the planet means this is a horse worth keeping a very close eye on.