Unknown Clark vs. Al Mattern — Career Comparison

Looking at the career totals, Unknown Clark and Al Mattern are fairly close on the surface numbers. Al Mattern posted stronger numbers in ERA (3.37 vs 7.5) and WHIP (1.394 vs 1.500). Unknown Clark had the advantage in home runs allowed (0 per nine innings vs 0.23). By the career numbers, Al Mattern 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.