Katie Ledecky
Kosuke Kitajima
Stat by stat
Bars are scaled to the leader in this list.
The verdict
Katie Ledecky leads 4 of 4 categories. Our all-time ranking places Katie Ledecky at #2 and Kosuke Kitajima at #8.
The case for Katie Ledecky
The most dominant distance swimmer, man or woman, in history, and the most decorated female swimmer at the World Championships with 21-plus titles. Ledecky won the 800m freestyle at four consecutive Olympics (London 2012 at age 15, Rio 2016, Tokyo 2020 and Paris 2024), a feat unmatched in the event, and owns the world records in the 800m (8:04.79) and 1,500m (15:20.48) freestyle. Through Paris 2024 she held nine Olympic gold medals and 14 Olympic medals overall. Her dominance is defined by margin: she has beaten fields by bodylengths and gone years unbeaten in the 800m and 1,500m. Where Phelps ruled range, Ledecky rules depth, holding a tempo across a mile that no rival can sustain, arguably the greatest single-discipline swimmer ever.
The case for Kosuke Kitajima
The greatest breaststroker of his era and a Japanese national icon. Kitajima achieved a feat no other man has managed, winning both the 100m and 200m breaststroke at two consecutive Olympics, Athens 2004 and Beijing 2008, a breaststroke double-double, for four individual golds and seven Olympic medals overall. He set multiple world records in the 100m and 200m breaststroke and won world-championship titles across the 2000s. Famous for his aggressive, powerful pull-out and racing intensity, Kitajima's Athens victory came amid a controversy over an illegal underwater dolphin kick that helped prompt the 2005 rule change legalising a single kick in the pull-down. He defined breaststroke for a decade before Adam Peaty raised the event to another level.