Michael Phelps
Katinka Hosszu
Stat by stat
Bars are scaled to the leader in this list.
The verdict
Michael Phelps leads 4 of 4 categories. Our all-time ranking places Michael Phelps at #1 and Katinka Hosszu at #10.
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The case for Michael Phelps
The most decorated Olympian in history across all sports. Phelps won 28 Olympic medals, 23 of them gold, over five Games from Sydney 2000 to Rio 2016, including a still-unmatched eight golds at Beijing 2008 that broke Mark Spitz's 1972 record of seven. He set 39 world records and claimed 26 world-championship titles. His range was staggering: Olympic gold in the 100m and 200m butterfly, the 200m and 400m individual medley, the 200m freestyle and a stack of relays. Coached by Bob Bowman, Phelps combined a huge wingspan, relentless training volume and famous racing nerve, touching out Milorad Cavic by 0.01 seconds in Beijing. No swimmer has matched his blend of longevity, versatility and championship hardware, and none is close on career gold medals.
The case for Katinka Hosszu
The 'Iron Lady', the most prolific racer of her generation and the queen of the individual medley. Hosszu won three gold medals at the Rio 2016 Olympics, in the 200m IM, 400m IM and 100m backstroke, and set world records in the 200m IM (2:06.12) and 400m IM (4:26.36) that showcased her all-round mastery. She amassed around nine world-championship titles and built an unprecedented career on the World Cup circuit, racing dozens of events per season for prize money and points, hence her nickname. Where most stars pick a lane, Hosszu contested every stroke and distance, and her medley dominance across the 2010s, combining butterfly, backstroke, breaststroke and freestyle at the highest level, made her one of the most versatile swimmers ever.