Brigid Kosgei smashed Paula Radcliffe's world record as the Kenyan star became the quickest woman to run a marathon in Chicago on Sunday.
Radcliffe's time of two hours, 15 minutes 25 seconds stood for 16 years, but Kosgei eclipsed the Briton's effort in monumental style on Sunday as she successfully defended her Chicago title.
A day after Eliud Kipchoge became the first person to run a marathon in under two hours, Kosgei recorded a remarkable time of 2:14:04 to shatter Radcliffe's record by 71 seconds.
The 25-year-old - the youngest winner of the London Marathon - was congratulated by Radcliffe at the finish line as her sensational year reached new heights.
Ababel Yeshaneh came second with a personal best of 2:20:51, almost seven minutes behind Kosgei, with fellow Ethiopian Gelete Burka completing the top three.
"I'm feeling good, happy, I was not expecting to run like this," Kosgei said. "The course was good - a little bit of wind, which pushed us a bit, but it was okay."
Kosgei's incredible run completed a supreme double for Kenya, with Lawrence Cherono winning the men's race.
Ethiopia's Dejene Debela looked well placed to clinch victory when he made a break for the line in the last kilometre, but he went too early.
Cherono took full advantage, driving clear in the final stretch to cross the line with the clock on 2:05:45. Asefa Mengstu came third.
However, it was a frustrating day for 2018 champion Mo Farah, who recorded his worst marathon run in six races at the culmination of a difficult week.
Farah - who accused the media of having a "clear agenda" against him when he was questioned over the conduct of his former coach Alberto Salazar, who has been banned for four years after being found guilty of doping violations - completed the race in eighth with a time of 2:09:58.