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There is some dispute among boxing historians about whether Ali or Joe Louis is the greatest heavyweight boxer of all time. While the International Boxing Research Organization ranks Louis as the best, a 1998 ranking in Ring magazine named Ali as the greatest heavyweight of all time. the heights and sustain his position. Many boxing fans and critics regard Robinson as, "pound for pound", the best boxer of all time. Muhammad Ali, who repeatedly called himself "The Greatest" throughout his career, has said without hesitation that, while he does consider himself the greatest heavyweight in boxing history, that he would rank Robinson the greatest fighter of all time. Other all time greats like Joe Louis and Muhammad Ali have said the same.