 McCallum survived some punishment in the first round and came back to stop the undefeated Jackson in the second round.McCallum really came to prominence when he knocked out former WBC welterweight title-holder Milton McCrory and former undisputed world welterweight champion, another future International Boxing Hall of Fame member, Donald Curry in 1987.Curry was ahead on all three scorecards going into the fifth round when McCallum knocked him out with what some have called a "perfect" left hook.