Phelps' win in the 200-meter butterfly avenged one of the few losses of his Olympic career -- a second-place finish to South Africa's Chad Le Clos in 2012. Le Clos finished fourth in Tuesday's race.
American Katie Ledecky smiles after winning the 200-meter freestyle. It is her second gold in the Rio Games. She also won the 400-meter freestyle.
Williams won gold in singles and doubles in the 2012 Olympics. But she is already out of both tournaments in Rio de Janeiro.