Josh Kerr set a men's mile world record of three minutes 42.66 seconds at the London Diamond League, surpassing Hicham El Guerrouj's 3:43.13 mark from 1999. The 28-year-old British athlete completed the run at London Stadium before a sell-out crowd of 60,000, improving the previous record by nearly half a second.

Kerr became the seventh British holder of the record and the first since Steve Cram in 1985. Before the race, his personal best of 3:45.34 was also the British record and placed him sixth on the all-time list. American Yared Nuguse, ranked fourth historically, was among his opponents, but Kerr separated himself after the pacemakers completed their work.

Two pacemakers led the early stages and had stepped away by 1,000 metres. Kerr continued alone, tracking pacing lights along the inside of the course. He passed 1,500 metres faster than his British record at that distance, reached 1,200 metres in 2:46.5 and covered each of the final three 100-metre segments in 13.7 seconds.

The attempt had been public since March, when Kerr announced that he would pursue the record on home soil. His training project was called “Project 222,” reflecting the total seconds targeted for the mile. A preparatory 1,200-metre time trial produced 2:42.45 at more than 5,000 feet of altitude in Albuquerque, although that effort used a running start.

Kerr's preparations followed recovery from a calf injury that ended his attempt to win gold at the World Championships in Tokyo the previous September. Coach Danny Mackey said the record became a goal after that return. For the London race, sponsor Brooks supplied a specially designed suit intended to improve aerodynamics and ventilation, along with spikes using a carbon plate, titanium pins and a shape designed for propulsion.

The result added a major distance record to Kerr's five global medals. The Edinburgh-born runner had twice reached an Olympic podium and won three world titles, including the 1,500 metres in Budapest in 2023. He planned next to compete at the Commonwealth Games in Glasgow.

Although the mile is not contested at the Olympics or World Championships, it retains a distinct place in athletics history. Roger Bannister first broke four minutes in 1954, and British runners including Derek Ibbotson, Sebastian Coe, Steve Ovett and Cram later held the global mark. Cram welcomed Kerr to that group, describing the mile record as an achievement that could exceed even championship medals in recognition.

Kerr had declared the target months in advance, making the London performance both a successful record attempt and the completion of a training campaign designed around the precise 222-second threshold.