Photo: Mledecky, CC0 — Source
American swimmer and the most decorated female swimmer in Olympic and World Championship history. She burst onto the scene at age 15 by winning the 800m freestyle at the 2012 London Olympics. She has won multiple Olympic gold medals across the 400m, 800m, and 1500m freestyle events and has set numerous world records. Her dominance in distance freestyle is so complete that she has won races by margins unseen in modern swimming. She graduated from Stanford University while maintaining her elite training. Her consistency and longevity at the top of the sport have drawn comparisons to Michael Phelps.
Source: Olympics.com