U.S. swimmer Katie Ledecky celebrates after setting a new world record in the 800-meter freestyle on Friday, August 12. It was her fourth gold medal in Rio and the fifth of her Olympic career. She also won the 800 free in London four years ago.
Spanish tennis players Rafael Nadal, left, and Marc Lopez acknowledge the crowd after winning gold in doubles. Nadal won singles gold in 2008.
Maya DiRado, right, looks up at her time after winning the 200-meter backstroke. DiRado was trailing Hungary's Katinka Hosszu, left, for much of the race but edged her at the end. It is DiRado's second gold medal in Rio.