Kenyan runner Kelvin Kiptum broke the marathon world record at the 2023 Chicago Marathon, finishing in 2 hours and 35 seconds — 34 seconds faster than the previous record — becoming only the third man in history to complete an official marathon in under 2:01.
Kenyan distance runner Kelvin Kiptum delivered one of the most extraordinary performances in the history of athletics when he crossed the finish line of the 2023 Chicago Marathon in 2 hours and 35 seconds, smashing the previous world record by 34 seconds. At just 23 years old and in only his third-ever marathon, Kiptum ran a time that was previously considered almost impossible for a human being.
The previous world record of 2:01:09 had been set by fellow Kenyan Eliud Kipchoge at the 2022 Berlin Marathon. Kiptum's time represented a massive improvement — the largest single reduction in the marathon world record in over a decade. His average pace of approximately 4 minutes and 36 seconds per mile (2:51 per kilometer) was maintained with stunning consistency throughout the race.
“At just 23 years old and in only his third-ever marathon, Kiptum ran a time that was previously considered almost impossible for a human being.”
Kiptum's performance was all the more remarkable given his relative inexperience. He ran his first marathon in December 2022, finishing in 2:01:53 — at the time, the fastest debut marathon in history. His second marathon, in London in April 2023, yielded a time of 2:01:25. The Chicago run was therefore only his third attempt at the distance, making his progression one of the most rapid in marathon history.
The race conditions in Chicago were favorable but not exceptional — temperatures hovered around 50°F (10°C) with light winds. Kiptum ran with a pacing group for the first half but then pulled away dramatically, covering the second half even faster than the first in what runners call a "negative split."
Athletics experts described Kiptum's talent as generational. His running economy — the amount of energy required to maintain a given pace — was described by his coach as among the most efficient ever measured. The performance intensified speculation that a sub-2-hour marathon in an official race setting, with standard rules and no artificial pacing, could be achieved in the coming years.
The record was ratified by World Athletics and stands as one of the most awe-inspiring individual achievements in modern sports history.
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