— LAUSANNEThe world record in the men's 1500 metres, a mark that had stood since the summer of 2015, fell on Friday evening in Lausanne in the kind of solo, beautifully judged run that athletics aficionados spend their lives waiting to witness.

The Norwegian, who had spoken in the days before the meet of his belief that conditions would be "cooperative," took the race out from the gun, hit a perfectly judged 800-metre split, and accelerated, almost imperceptibly, with three hundred metres remaining. The pacemakers, themselves world-class runners, were dropped before the bell. The bell sounded to a stadium that had begun, audibly, to understand what it was watching.

He crossed the line in three minutes, twenty-six seconds, and a fraction — a time more than a second clear of the previous world mark and faster, by a measurable margin, than any 1500-metre run by a human being of any era.

"This is the kind of evening you organise an entire season around," the meet director said in a brief televised interview shortly after the race, though by then the runner himself had already disappeared into the warm-down area, declining, with characteristic restraint, to make any immediate statement.