Seventeen-year-old Tyrese Cooper, easily one of the fastest teenagers in America and among the fastest people in the world, trains on a homemade dirt track in Miami Gardens. Raised in a cozy house in the throes of Liberty City, the tall and willowy high-school junior has broken nearly every national high-school track record in which he's competed. That's an especially rare feat because most competitive runners stick to a single race. High-school track meets, especially short-distance events, are typically neck-and-neck contests. But two years ago, Cooper caught everyone's attention when the no-name eighth-grader began leaving freshmen and sophomores at least ten meters behind him at the finish line. Now Cooper doesn’t run to win; he runs for time. In the 400-meter, his signature race, the shy teen clocks 45.23, which makes him one of the ten fastest people on Earth. In that event, Cooper is faster than Usain Bolt was at his age. Cooper will likely go pro at the end of the year, and he's a shoo-in to represent the United States at the World Championships in London this August. After that? Medals await at the Tokyo 2020 Olympics.