Michael Kelly vs. Mark Mercer — Career Comparison

On the career pitching numbers, Michael Kelly posted a stronger line than Mark Mercer. Michael Kelly posted stronger numbers in ERA (3.04 vs 4.7) and WHIP (1.287 vs 1.826). By the career numbers, Michael Kelly 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.