John Costello vs. Unknown Soldero — Career Comparison

Looking at the career totals, John Costello and Unknown Soldero are fairly close on the surface numbers. John Costello posted stronger numbers in ERA (2.97 vs 6) and WHIP (1.395 vs 1.500). Unknown Soldero had the advantage in home runs allowed (0 per nine innings vs 0.74). By the career numbers, John Costello 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.