Pick someone to beat these GOAT candidates: Bob Fitzsimmons Joe Gans Sam Langford Harry Greb Sugar Ray Robinson Henry Armstrong Joe Louis Ezzard Charles Muhammad Ali Roberto Duran Criteria: 1. GOAT candidates are at their peaks. 2. An opponent have to fight within the same weight division. 3. An opponent have to fight at most 40 years after GOAT candidate. So no 1910s vs 2010s comparisons.