In her Olympic debut, Sha'Carri Richardson had to settle for the silver medal in the women's 100-meter race.
Instead, it was Saint Lucia's Julien Alfred who earned gold, at 10.72 seconds - USA's Melissa Jefferson received the bronze.
It's the first time since 1996 in which two Americans medaled in the event.
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The 24-year-old was all set to compete in Tokyo three years ago, but tested positive for cannabis shortly afterward.