Kenya's Brigid Kosgei shattered Paula Radcliffe's 16-year-old world record Sunday, winning the Chicago Marathon in two hours, 14 minutes and four seconds.
Kosgei broke the mark of 2:15:25 set by Radcliffe in the London Marathon on April 13, 2003 as she won in Chicago for the second straight year.
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The 25-year-old's performance continued a remarkable weekend in the punishing event, coming a day after fellow Kenyan Eliud Kipchoge became the first man to break two hours at the distance when he clocked 1hr 59min 40.2 sec on a specially prepared course in a Vienna park.
Many rated Kosgei's effort as the superior run.
Kosgei, who also won in London in April and clocked the fastest half-marathon in history this year of 1:04:28 at the Great North Run, quickly separated herself from the women's field as she ran with two male pacesetters.
Lawrence Cherono made it a Kenyan double with victory in the men's race, as Mo Farah finished a distant eighth to end a week when he hit back at critics over his work with disgraced coach Alberto Salazar.
Kosgei crossed the finish line alone, with Ethiopians Ababel Yeshaneh and Gelete Burka a second and third in 2:20:51 and 2:20:55.
"I'm happy and I feel good," Kosgei said. "People were cheering all along the course, which gave me more energy. I felt my body was moving, moving, moving so I went for it."
While the IAAF called the 2:17:01 clocked by Mary Jepkosgei Keitany at the 2017 London Marathon a "women only" world record posted without male pacesetters, it's Radcliffe's mark — so long untouchable — that has been the grail for female marathon runners.
The British great was in Chicago and posed for photos with Kosgei. "I think we've always known that time was going to come," Radcliffe said. "When I saw how fast Brigid was running in the first part of the race, if she was able to hold that together, she was always going to beat the time."
Radcliffe had also held the Chicago course record of 2:17:18 — set in winning the 2002 race in what was then a world record.
"That was a very special day for me and it's a very special day for Brigid today," Radcliffe said.
Kosgei signalled her intentions with an astonishing first five kilometres in 15:28 — so far inside Radcliffe's world record pacethat it seemed she might have ruined her chances out of the gate.
But she settled into a more sustainable rhythm, and powered relentlessly to the finish line.
Her halfway split of 1:06:59 had Kosgei comfortably inside world-record pace, and her lead expanded over the second half as her pursuers felt the effects.
The pacesetters dropped away in the closing kilometres, leaving Kosgei to break the tape alone, her arms raised in celebration.
CHERONO SPRINTS TO WIN
Cherono won a men's race that came down to the wire in 2:05:45 — barely edging Ethiopia's Dejene Debela who was second in 2:05:46 with another Ethiopian, Asefa Mengstu, third in 2:05:48.
Last year's winner Farah was never a factor — finishing in 2:09:58. The Briton — who set a European record in Chicago last year — was among an early lead group that began to disintegrate around the 10km mark, leaving half a dozen runners, including Cherono, setting the pace.
Kenya's Bedan Karoki challenged late but faded before the last turn toward the finish to leave Cherono, Debela and Mengstuto sprint for the line.
"All of a sudden when we reached 41km the (others) were not going again," Cherono said. "I decided to kick and felt I was still having enough energy to sprint. I tried my luck, and it worked."
US distance running guru Salazar has been banned for four years by the United States Anti-DopingAgency for a string of doping violations.
Nike shut down its Oregon Project running group headed by Salazar, and four-time Olympic gold medallist Farah arrived in Chicago for his defence to find himself again denying any irregularities during his time with the coach.