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“I was never worried that I'd lose this,” said a confident Sumgong. “At 35km I noticed that my other two team-mates had dropped off and that gave me the motivation to carry on.”
Earlier, Olympic debutant Volha Mazuronak of Belarus shook up the pack at the halfway stage, taking the lead and briefly pulling ahead of the lead group. Her move pushed the pace, stringing out what had been a lead pack of more than two dozen runners, causing some to drop back.