Kenya's Sabastian Sawe broke the two-hour mark for the first time in history on Sunday in winning the London Marathon.
The defending champion was locked in a tight battle with Ethiopia's Yomif Kejelcha in the closing stages but surged clear to cross the line in 1hr 59min 30sec.
Kejelcha also dipped under two hours, with a time of 1:59:41, with Uganda's Jacob Kiplomo third (2:00:28).
All three finished under the previous men's world record of 2:00:35 set in Chicago in 2023 by the late Kelvin Kiptum.
Kenya's Eliud Kipchoge ran 1:59:40 in October 2019, becoming the first person in recorded history to do a sub-two-hour marathon.
But the time was not ratified as a world record because he ran with specialised shoes, standard competition rules for pacing and fluids were not followed, and it was not an open event.
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Sawe, wearing Adidas's new Pro Evo 3 supershoe, which weighs less than 100 grams, suggested before Sunday's race that a course record or even a world record was in his sights.
He led a group of six as they passed the halfway point in a time of 1:00:29.
Sawe and Kejelcha pulled clear of the rest of the pack and stayed together until the final stages before the Kenyan kicked for home.