Saturday marks the end of the high-profile swimming events at the Summer Olympic Games in Rio de Janeiro, with U.S. star Michael Phelps set to swim his last race, the 4X100-meter medley relay. Also Saturday, the Jamaican sprinter known as the world's fastest man, Usain Bolt, began his Olympic events with the first heat of the 100-meter sprint. The 29-year-old Bolt, who has set and broken his own world records for the race, is fully expected to be competing in the finals Sunday night despite a sore hamstring.
Day 8: Rio Olympic Games
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Zeng Yi Wang and reacts Daniel Gorak , left, of Poland celebrate their win against Maharu Yoshimura and Koki Niwa of Japan during their men's team table tennis quarter final match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 13, 2016.
