Michael Phelps
Adam Peaty
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 Adam Peaty at #9.
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 Adam Peaty
The most dominant single-event swimmer of the modern era. Peaty transformed the 100m breaststroke, becoming the only man ever to break 57 seconds and setting the world record at 56.88 in 2019, a mark far ahead of the rest of history. He won Olympic gold in the 100m breaststroke at Rio 2016 and Tokyo 2020, plus a mixed-relay gold, for three Olympic golds, and collected around eight world-championship titles. His 'Project 56' target became a byword for pushing a barrier thought unreachable. Between 2014 and 2021 he was undefeated in the 100m breaststroke at every major final, a streak of dominance rare in any sport. His combination of stroke rate and power rewrote what the event could be.