The world of women's 400m hurdles was dominated this year by two Americans: Dalilah Muhammad and Sydney McLaughlin. At the 2019 World Championships, both athletes were so far ahead of the field, they were practically running another race. Dalilah won the world title and broke the 400m world record twice; she's had her breakout year. Now it's Sydney's turn: she finished second at the world championships with a personal best time, the third fastest in history, but was clearly hungry for more. She'll get her chance at the Olympics next year, which promises to be another showdown between these two up-and-coming track stars.