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The Jamaican seized the title of "world's fastest man" for an unprecedented third time. In the men's 400, South African Wayde van Niekerk was not only a surprise winner — he set a world record.
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You can't follow everything in Rio, but you want to catch the highlights. Here's a guide to the American athletes and events likely to produce the most memorable performances.
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Bolt was accidentally knocked down by a cameraman on a Segway. Bolt took the accident in stride, saying he suffered a few cuts but nothing serious.
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The incident happened at the World Athletics Championships, where a highly anticipated match-up had pitted the Jamaican against America's Justin Gatlin.