Sharkey by a mile. From 1925, after a couple of years learning the trade by fighting more experienced fighters until the loss to Carnera in 1933, he had four losses in 32 fights to Gorman(avenged) Schmeling(foul) Dempsey(controversial) and Risko (split decision). But its the quality of his opposition that actually points to a consistency of performance rarely matched at heavyweight. McTigue Godfrey Wills Gorman Maloney Risko Delaney Loughran Stribling Schneling Carnera Renault Heeney all failed to beat Sharkey in that period. Sometimes, for sure, his performance dipped, but the level of opponents guaranteed some lesser performances.
