WATCH: U.S. ninth grader runs 45-second 400m at Penn Relays

The 15-year-old sprinting phenom, Quincy Wilson, ran a 45.06 anchor leg during a 4x400m relay

Michigan freshman drops 51-second 400m split for incredible relay comeback

Ziyah Holman made up a four-second gap in the final leg of a thrilling 4 x 400m relay race to steal the win for her team