.................Ali.................
Ah no..that was Rocky Marciano..
At least you didnt say floyd mayweather.
From a combat sports pov, ali was the best because of his mix of achievement, showmanship and skill.
Youngest heavyweight champ till tyson, olympic gold medalist, and 3 time lineal champ.
His showmanship brought the entire sport more viewers and money.
He was an extremely active philanthropist, and tutor to generations of boxers and combat sport athletes.
