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Nijel Amos(C) of Botswana competes during the men's 800m Final of 2019 Nanjing IAAF World Challenge meeting in Nanjing, capital of east China's Jiangsu Province, on May 21, 2019. (Xinhua/Li Bo)
Nijel Amos(C) of Botswana competes during the men's 800m Final of 2019 Nanjing IAAF World Challenge meeting in Nanjing, capital of east China's Jiangsu Province, on May 21, 2019. (Xinhua/Li Bo)