Speedball Hackett vs. Robin Roberts — Career Comparison

On the career pitching numbers, Robin Roberts posted a stronger line than Speedball Hackett. Robin Roberts posted stronger numbers in ERA (3.41 vs 10.8) and WHIP (1.184 vs 2.850). By the career numbers, Robin Roberts had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.