Josh Kerr ran 3:42.66 at the London Diamond League to break Hicham El Guerrouj's 27-year mile world record. Inside the race, the splits, and what it means.
The mile world record is one of the most sacred numbers in athletics, and for 27 years it belonged to Hicham El Guerrouj.
On Saturday night at the London Diamond League, Josh Kerr took it from him.
The 28-year-old Scot crossed the line at London Stadium in 3 minutes, 42.66 seconds, shaving 0.47 seconds off El Guerrouj's legendary 3:43.13 mark from Rome in 1999.
It is the fastest mile ever run by a human being. And it happened in front of a British crowd, at the meet Kerr grew up watching on television.
The plan had a name long before the gun. Kerr and his sponsor called it Project 222, a reference to his target time of 222 seconds flat.
Two pacers dragged the field through the first 1,000 metres on schedule.
Then they peeled off, and Kerr had to do the hardest part of the job on his own.
From that moment he ran alone from the front, with Yared Nuguse chasing hard in second.
Nuguse, the American who had run 3:43.97 last year to sit just nine-tenths off the old record, finished in 3:45.69.
Nuguse was the pre-race danger. He had led the Diamond League season and already beaten Kerr in Oslo.
On this night none of it mattered.
Kerr held the pace. Kerr held the pace.
The clock read 3:42.66, and a piece of history quietly changed hands.
The mile is 1,609.34 metres, four laps of a standard 400-metre track plus an extra 9 metres.
Kerr's average pace was roughly 55.7 seconds per lap. That is a full-tilt 400-metre effort, held for four laps in a row.
Put another way, he covered every 100 metres in about 13.85 seconds.
That is close to what most club sprinters run for a single 100 metres, and Kerr did it sixteen times back to back.
El Guerrouj's 3:43.13 was not just old. It was one of the oldest world records still standing anywhere on the track.
It survived the super-shoe era. It survived Jakob Ingebrigtsen's 3:43.73 in 2023, which came within seven-tenths and was widely called the closest anyone would ever get.
Kerr himself entered 2026 with a mile personal best of 3:45.34, already the British record, but still 2.21 seconds outside the world mark. In middle distance, 2.21 seconds is a canyon.
He closed the canyon in a single night.
The mile world record has a strange relationship with Great Britain.
Roger Bannister ran the first sub-four-minute mile at Oxford in 1954, and for the rest of that century Britons kept trading the record back and forth.
Sebastian Coe held it. Steve Ovett held it.
Steve Cram set the last British mark, 3:46.32, in 1985.
Then it left Britain for four decades. Now it is back, and it belongs to Kerr.
It is easy to watch a 3:42 mile and file it under "not relevant to you."
That would be a mistake.
There are lessons hiding in the way Kerr trains and races that translate at any pace.
Kerr and his coach Danny Mackey plan a whole season around one or two big targets, and let everything else be preparation.
For a marathoner, that might be one goal race a year, with everything supporting it.
The temptation to race everything hard is what leaves most runners flat when it counts.
55-second laps do not appear on race day out of nowhere. They live inside months of controlled interval work.
The same logic applies at any distance. If you want to run 8:00 miles in a half marathon, you have to spend time running 7:30 miles in training, in controlled pieces.
If you need a refresher on structuring that work, our full guide to beginner track workouts that make you faster and stronger has you covered.
Kerr told the BBC before the race that he felt confident enough to talk about it publicly.
Naming the goal, out loud, is a form of accountability most athletes flinch from.
You do not have to announce your goal race to the world. You do have to be honest with yourself about what you are training for and why.
The mile has been having a moment. In March, 15-year-old Sam Ruthe became the first 15-year-old ever to run a sub-4-minute mile, a barrier that stayed intact for 71 years after Bannister broke it.
Faith Kipyegon took her own historic swing at the women's sub-4 attempt. And Jakob Ingebrigtsen has just launched a running team open to everyone, pulling the sport toward the community end of the spectrum.
For decades the mile felt frozen. Now it moves again.
Kerr's 3:42.66 is now the official mile world record, pending ratification. The full list of world track and field records is maintained by World Athletics on its official records page.
Two weeks from now, Kerr races the Commonwealth Games in Glasgow.
On home soil, in front of a Scottish crowd.
It is difficult to imagine a more loaded fortnight in a middle-distance career.
World record on Saturday, home Commonwealths in a fortnight, a generation of British milers watching from the wings.
El Guerrouj's 3:43.13 lasted 27 years and outlived a whole shoe technology cycle. Kerr's 3:42.66 may not get the same courtesy.
Ingebrigtsen has already come within seven-tenths. Nuguse is still improving.
Somewhere out there, a 15-year-old is watching this on his phone and doing the mental math on what would be possible if he took it a little more seriously.
That, more than the record itself, is the real gift of a night like this. It moves the ceiling.
It gives every runner permission to want a little more.
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