Men's world record in the marathon set in Chicago by Kenya's Kelvin Kiptum
This year, Kiptum broke the course record for the London Marathon.
He was determined to do the same thing in Chicago, so he sped up past the 35-kilometer mark and raised his arms in the air to cheers from the crowd.
"I'm so happy. At the finish line, he said, "I wasn't ready." "A world record was not in my mind today."
He broke the record three minutes and 27 seconds before Benson Kipruto, who was from Kenya.
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Bashir Abdi, who was from Belgium, came in third with a time of 2:04:32.
The 23-year-old wasn't going for the record at first, but he said he knew Kipchoge's previous record of 2:01:09 was close in the last few kilometers as he pushed himself to make history.
In only his third marathon, Kiptum made it a one-man race at 35 kilometres and took advantage of Chicago's flat terrain to alter gears.