America's newest star wrote her name in lights by uniting the 200m, 400m and 800m freestyle for the first time since 1968 -- winning two of the races in world-record time. Ledecky, 19, has four gold medals overall including the 4x200m freestyle relay, plus silver from the 4x100m free. The most extraordinary stat for Ledecky is that she has never lost an individual final at a world championships or Olympics, compiling nine world titles before she has even reached her twenties. She burst onto the scene at the 2012 London Olympics, when she won the 800m at just 15. And she has confirmed every ounce of her promise with her feats in Rio, which include world records in the 400m and 800m. minously for her competitors, Ledecky may be reaching her peak for Tokyo 2020.