At the 23-mile mark, Kiprotich turned the corner and was gone.
It was bright and sunny but grew hot, especially late in the race.
While other runners wore the colors of their countries, Guor Marial donned a predominantly gray and black uniform with “I.O.A.” printed on it. He wound up 47th, 11:31 behind the winning time.
Marial competed as an independent runner under the banner of the International Olympic Committee after fleeing a refugee camp in what is now South Sudan during a civil war more than a decade ago.
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