And no, it wasn't Muhammad Ali.
By most objective measures, the greatest heavyweight champ of all time was a guy called Joe Louis.
He reigned for nearly twelve consecutive years (June 1937 - March 1949) and made a record 25 successful consecutive title defences.
Since 1949, every heavyweight champ has tried to break or even match this record. All have failed. That's how good Louis was.
His title fight record was 26 wins, 1 loss (a points defeat to Ezzard Charles - Louis was forced back in the ring in 1950 to pay off his considerable debts).
As a fighter, his strengths vastly outweighed his weaknesses.
When Louis was still a contender, ex-champ Schmeling KO'd him over 12 rounds in 1936 but Louis got his revenge in 1938 - a first round KO. If you want to see a first round massacre, just search Louis-Schmeling 2 on youtube.
Louis had a great combination of fast hands, accurate punching, and explosive punching power. He was also very patient, waiting for the best time to strike.
What a fighter …