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Usain Bolt, the Jamaican runner who hasn't lost an Olympic race since 2008, just won his first race of the games, the first round of the 100 meter heats, in 10.07. And he did it so casually that, to observers, it resembled more of a jog than a sprint.

https://vine.co/v/5hmVQgE5bPx

Here are some of the best reactions to the fastest man in the world:

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