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Fred Kerley of the United States celebrates after the men's 400 meter final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 4, 2019. (Xinhua/Jia Yuchen)
Fred Kerley of the United States celebrates after the men's 400 meter final at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Oct. 4, 2019. (Xinhua/Jia Yuchen)