John Costello vs. Dick Mulligan — Career Comparison

Looking at the career totals, John Costello and Dick Mulligan are fairly close on the surface numbers. John Costello posted stronger numbers in ERA (2.97 vs 4.44) and WHIP (1.395 vs 1.494). Dick Mulligan had the advantage in home runs allowed (0.11 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.