Some outstanding athletes who have experienced considerable success in past Olympics will be participating in their final Summer Games in Rio. Many of them still have the skill to collect more medals in their last Olympic appearance.
We take a look at eight successful athletes who may be on their Olympic farewell tour, but have a chance to go out with a bang by capturing medals in their last hurrah.
In many cases the public or the athletes themselves don't know whether this will be their Olympic swan song, so some informed guesswork is involved.
This list intentionally focuses more on Americans, with all but one of the athletes mentioned representing the United States.