<iframe src="http://www.npr.org/player/embed/3874403/3874404" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
The concluding event at this year's Olympics will be the men's marathon on Sunday. The last American to win it was commentator Frank Shorter, who captured gold at the Munich games in 1972.
NPR thanks our sponsors
Become an NPR sponsor