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Christian Coleman (3rd R) of the United States sprints with his compatriot Justin Gatlin (2nd R) during the men's 100m final at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019. (Xinhua/Li Gang)

Christian Coleman (3rd R) of the United States sprints with his compatriot Justin Gatlin (2nd R) during the men's 100m final at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019. (Xinhua/Li Gang)