The Jamaican seized the title of "world's fastest man" for the third time, an unprecedented feat. In the men's 400, South African Wayde van Niekirk was not only a surprise winner, he set a world record.
Thursday's theme was American stars battling each other. Biles topped Aly Raisman as they went 1-2 in the women's all-around. Michael Phelps easily defeated Ryan Lochte in their showdown in the pool.
Emmanuel Matadi was a state champion sprinter in high school and smashed records running for Minnesota State University, Mankato. On Saturday, Matadi will make his Olympic debut in Rio on the Liberian national team.
"For all the moms out there, I hope that this was a very inspiring day," Armstrong said after winning her race and making Olympic history in Rio de Janeiro.
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Wins by Katie Ledecky and Michael Phelps have helped American swimmers dominate the competition in what is proving to be an exceptional Olympic showing.
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