Speed is the theme for Day 8 of the Olympics, on land and on water.
Michael Phelps' farewell swim in his attempt to win another gold medal and a wide-open race to determine the world's fastest woman highlight the second Saturday of the 2016 Olympic Games. The likely coronation of an American rowing dynasty is also on tap for the day.
The gold-medal match in women's tennis is scheduled for Saturday as well.
However, the focus on Day 8 will be on the speed of Phelps in what is likely to be his last Olympic race, the speed of a half-dozen gold-medal contenders in the women's 100-meter dash and the speed of the United States' women's eight crew as it bids to continue a 10-year winning streak.