How Leon Marchand became the KING of the Games: A body like a torpedo, the technique of a dolphin and eating enough food to feed a family of four, the French double Olympic champion now has Michael Phelps in his sights

The noise is a part of his fuel. The vast, rhythmical, incantatory chant of Allez every time his head surfaced from the water on Wednesday night as he powered to victory in the 200 metres breaststroke.