these lists are always a bit skewed for me you could easily swap louis for ali ain number on spots and as far as heads up matchups Joe louis would get killed by many lesser fighters than Ali(thats not the point though its comparing best in an era and whos regin had the best in that era i suppose) Marciano also he was undefeated so its difficult to put him up that high but hed lose easily to someone like ali and ilove marciano. Holmes another great fighter whos got an arguement he held the title for an enourmous amount of time but his era sucked... kesaydah