Josh Kerr breaks mile world record with 3:42.66s run at London Diamond League

London Stadium Performance and the End of a 27-Year Record

In a race that lived up to the significant anticipation surrounding it, Josh Kerr crossed the finish line at London Stadium in 3:42.66. The performance officially eclipsed the long-standing world record of 3:43.13, established by Hicham El Guerrouj in 1999—a time that had stood for longer than any previous mile world record. As noted in reporting, the record had remained untouched since 1999, when Kerr was aged one.

The race saw Kerr maintain a blistering, metronomic pace. He was initially assisted by two pacemakers: his Brooks Beasts teammate Brandon Kidder, who led through 800m, and Zan Rudolf, who led to the 1,000m mark. After the pacemakers were gone, Kerr remained peerless as he pressed on in pursuit of the wavelights on the curb of the track measuring his progress. He clocked individual laps of 54.75s, 55.88s, and 55.76s before hitting the bell. While U.S. record-holder Yared Nuguse was chasing behind him over the final lap, as was Jake Heyward, Kerr showed supreme speed to widen his lead and win by three seconds.

Project 222: Bespoke Preparation and Technical Innovation

Kerr’s record-breaking run was the culmination of an intensive eight-month initiative branded “Project 222.” The name was known for the exact number of seconds it would take to set a new world record. To support his goal, his sponsor, Brooks, provided specialized equipment tailored to his specific biomechanics and unique gait.

Brooks designed a custom speed suit and racing spikes for the athlete. The suit was crafted to enhance aerodynamics and breathability, featuring laser-cut perforations that release heat and humidity while enhancing mobility. The spikes were designed for Kerr’s biomechanics, including his unique foot strike, asymmetrical push-off, and demand for an ultra-aggressive ride. Following the race, Kerr credited his support network for the technical and physical foundation of the run.

That was not me, that was my team every single step, Kerr said in an on-track interview, a reference to the support that Brooks had given him in developing a bespoke spike and speed suit for this race.

Career Context and Future Aspirations

Although Kerr is primarily known for competing in the 1500m—a more traditional distance—his transition to the mile proved highly effective. Kerr won the 2024 silver medal in the event, took bronze in the 1500m race in 2020, and won the gold medal in the 1500m event at the 2023 World Championships in Budapest. His new record represents a significant improvement over his previous personal best of 3:45.34, set in 2024, which had helped him set the 10th fastest mile time in history. Kerr had lined up as the sixth-fastest man in history over the mile prior to this performance.

Reflecting on the pressure of the attempt, Kerr acknowledged the difficulty of announcing his intentions back in March. It's very overwhelming with the amount of hype [I created]. It's silly to call [the attempt] that early because there's a lot of things which can go wrong, Kerr said. The emotion was evident on his face as he raised his arms aloft in celebration after going through 1500m faster than his British record over that distance.

Kerr, the seventh British athlete to claim the mile record and the first since Steve Cram in 1985, delivered in emphatic fashion on home soil. With the world record now in his possession, Kerr has firmly cemented his status in the history of the sport.