Eliud Kipchoge obliterated the marathon world record with an astonishing 2:01.39 run in Berlin on Sunday.
With good weather on the right course, there was little doubt after Monza that Kipchoge would soon seal his legacy by owning the world record.
The 33-year-old, widely seen as the greatest marathon runner of the modern era, ran an official time of time of two hours, one minutes and 39 seconds on a sunny and warm autumn day along the flat inner-city course to beat Dennis Kimetto's world best by a minute and 18 seconds in Berlin back in 2014.
The leading duo went through 25km in 1:12:24, and as Kipsang continued to fade in the second group, Kipchoge left Boit, who dropped out of the race.
"I am just so incredibly happy to have finally run the world record as I never stopped having belief in myself". It was just a matter of how much time he could take off Kimetto's record.
"I lack words to describe this day", Kipchoge said.
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Things looked to have fallen apart for Kipchoge's world record hopes after 15km.
Ethiopian Ruti Aga finished second in 2:18:34 and six-time Olympic and six-time world medallist Tirunesh Dibaba third (2:18:55), making more history as it was the first time three women have broken 2:19 in one race.
"They say you miss two times but you can't miss the third time", he said, breaking the mark in his latest attempt in Berlin.
It was up to Kipchoge to run the final 17 kilometers alone and maintain the cushion of time that he built up to get under the world record. "That's what pushed me in the last kilometres", Kipchoge said, adding that he could have gone even faster had the pacemakers stayed with him up to the 30-km mark. A year ago he set the fastest ever time over the marathon distance on the Monza race track in Italy for Nike's Breaking2 project.
Kipchoge did not stop running at the finish line but accelerated. He has been virtually unbeatable at the distance, winning 10 of 11 marathons he has entered.