John Foley vs. Mark Mercer — Career Comparison

On the career pitching numbers, John Foley posted a stronger line than Mark Mercer. John Foley posted stronger numbers in ERA (4.5 vs 4.7) and WHIP (1.375 vs 1.826). By the career numbers, John Foley 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.