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Kenya's Eliud Kipchoge (5th R) starts during the match of "1:59 challenge" in Vienna, Austria, on Oct. 12, 2019. Kipchoge attempted to run a sub two-hour marathon here. (Xinhua/Guo Chen)

Kenya's Eliud Kipchoge (5th R) starts during the match of "1:59 challenge" in Vienna, Austria, on Oct. 12, 2019. Kipchoge attempted to run a sub two-hour marathon here. (Xinhua/Guo Chen)