Kenya's Eliud Kipchoge won the men's Olympic marathon with a dominating performance, running alone into the Sambadrome and finishing in two hours, eight minutes and 44 seconds on Sunday.
Ethiopia's Feyisa Lilesa claimed the silver medal and American Galen Rupp took the bronze in humid conditions on a rain-slicked course.
Kipchoge, 31, began to split the field after around 30 kilometres, starting with a group of a dozen runners about him that slowly dropped away until he ran the final kilometers alone.
"It was a championship and it was a bit slow so I decided to take over. Maybe it was the rain, maybe not. Everyone wants a medal. I was coming here for gold," said Kipchoge, who has won seven of the eight marathons he has entered, including two London Marathon victories.
In previous Olympic appearances, in 2004 and 2008, he had competed in the 5,000 metres before shifting his focus to the longer distance.
Rupp, 30, also made the transition from a short event but did so at the same Games, having finished fifth in the men's 10,000 metres eight days ago.