Swimmer Regan Smith made major waves (sorry, we had to) when she broke two world records at the 2019 FINA World Championships, one of which belonged to Missy Franklin. The backstroke specialist is just 17 and recently committed to swim at Stanford, the former training ground of both Katie Ledecky and Simone Manuel. Though she won't have a chance to qualify for the Olympics until the Trials next year, Regan is setting herself up as the one to beat.