Forget death and taxes, in Tokyo it’s queues, health questionnaires, and the men’s 100m breaststroke. There are not supposed to be any certainties in sport, but Adam Peaty’s chances of winning a second gold in the event here in Tokyo feels as close to inevitable as you can get. His dominance is unprecedented. He has won it at the last three world championships, as well as the Rio Olympics, has broken the world record five times in five years, and swum the 17 fastest times in history, four of them this spring and summer. There isn’t another man in the field who has got within a second of his personal best.