Katie Ledecky
Sarah Sjostrom
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 Sarah Sjostrom at #11.
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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 Sarah Sjostrom
The finest sprint and butterfly swimmer Europe has produced and a model of longevity. Sjostrom won the 100m butterfly at Rio 2016 in a world-record 55.48 that still stands, then reinvented herself as a freestyle sprinter, winning both the 50m and 100m freestyle at the Paris 2024 Olympics after an elbow injury that nearly ended her career. She has claimed three Olympic golds and around seven medals overall, together with roughly eight world-championship titles and world records in the 50m butterfly and 50m freestyle. First reaching a major final as a teenager in 2008 and still winning golds sixteen years later, Sjostrom's blend of explosive speed and career durability across two distinct specialties is almost unique in the sport.