The race got off to a slow start with the field going for the women's only world record, without the aid of male pacemakers.
The pace at the 15-km mark was exactly four minutes down on that set by Keitany when she broke the women's only world record in the 2017 London Marathon.
Yet it started to pick up as Cheruiyot ran a 5:08 15th mile out in front.
(Reporting by Peter Hall; Editing by Toby Davis)
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