Morolake Akinosun is going to Rio as a member of the USA Track & Field 4x100m relay pool.
She's a 22-year-old who's set to graduate from Texas this year, and she already won gold representing the U.S. in the 2015 Pan American Games.
Akinosun had confidence that this success would come. She tweeted about it five years ago.
Akinosun told BuzzFeed News that she sent out the prophetic tweet in 2011 shortly after watching the televised World Championships for Track and Field.
"Watching it may have inspired me to tweet that," Akinosun said to BuzzFeed News.
"At the time I tweeted that out, it was more of a dream and an aspiration," Akinosun said. "A goal has to be somewhat realistic," she added, explaining that in 2011, "I wasn't on the level yet and I didn't know for sure that I would ever get there, but I for sure wanted to get there."
Akinosun said she tweeted a lot of different things when she was 17 and had forgotten about the tweet - until it showed up recently on her Timehop app.
"A few days ago on Timehop, the tweet came up," Akinosun said. "And I just thought to myself, 'This is crazy.'"
"I had no idea the tweet was going to become this big," Akinosun said of her post, which has already been shared more than 160,000 times.