Originally Posted by Equinox

I don't deny Slater's greatness.

But if you want to talk about a truly remarkable dominance in a sport that requires probably the most dedication of any, Phelps tops the list. I swam competitively for 17 years on an International level and the insanely difficult task to dominate in a fashion in which Phelps ruled the pool for the past 10 years is staggering.