Zach McAllister vs. Al Williamson — Career Comparison

On the career pitching numbers, Al Williamson posted a stronger line than Zach McAllister. Al Williamson posted stronger numbers in ERA (0 vs 4.15) and WHIP (0.500 vs 1.412). By the career numbers, Al Williamson 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.