Usain Bolt is keenly aware of the narrative of his extraordinary career and, for the fastest man who ever lived, the only fitting way to close its Olympic chapter is with a third sprint sweep at next month's Rio Games.
Bolt is already assured of a place not only in the pantheon of his own sport but alongside the likes of Muhammad Ali, Pele, Michael Jordan and Jack Nicklaus - men whose names alone conjure up the notion of sporting excellence.