Elaine Thompson-Herah repeats as Olympic sprint champ in stacked women's 100m

Elaine Thompson-Herah successfully defended her Olympic title in the women's 100 metres on Saturday, crossing the line in 10.61 seconds to lower Florence Griffith Joyner's Summer Games record by 1-100th of a second. Canada's Andre De Grasse advanced to the men's semifinals in a season-best 9.91.