I reckon Marciano and Carnera are tied for first. Norton, Ali, Bruno, Dempsey and Morrison are all in the mix to.
Muhammad Ali, Frank Bruno, Gerry Cooney, Jack Dempsey, George Foreman, Sonny Liston, Rocky Marciano, Tommy Morrison David Tua, and Mike Tyson.
It is pretty much Marciano, than everyone else. Not even the great Ali gets more post than Marciano. Post wise, Marciano is the greatest of all time. Eat that SRR, Ali, Armstrong, Greb, ete.
Gerry Cooney may not be the most mentioned but he gets the most attention out of proportion to his talent
49-0, 43 knockouts! He knocked out everyone he fought, except the iron chinned legends of the ring, Don "The Lumberjack" Mogard, Ted "The Tiger" Lowry (twice), and Willis "The Warrior" Applegate! Rocky "The Brockton Blockbuster" Marciano! Gigantipithacus Blacki would have trembled in his cave if that name had ever been uttered within the range of his hearing.