At 22, Klitschko had Olympic gold, fast hands and a growing reputation built largely in German rings. Puritty was 31, with 13 defeats and little of the younger man’s polish. This was supposed to be another step toward the top.

Yet Wladimir had never boxed beyond eight rounds. His ability to overwhelm opponents had left him largely untested in the final third of a long fight.

Repeated blowouts can teach a prospect to keep increasing the pressure until someone falls. He gets fewer opportunities to recognize when his own pace is becoming wasteful, or to practice winning a round without trying to finish his oppon