
Wladimir Klitschko (born 1976) dominated the heavyweight division for nearly a decade, holding the IBF, WBA, WBO, and IBO titles simultaneously and making 18 consecutive title defenses.
Klitschko's textbook jab-and-grab style frustrated opponents and protected his chin after early-career KO losses. His combination of size, jab, and right hand made him virtually impossible to hurt during his dominant years.
Reference:
TaskLoco™ — The Sticky Note GOAT