Mark Mercer vs. Ed Weiland — Career Comparison

On the career pitching numbers, Mark Mercer posted a stronger line than Ed Weiland. Mark Mercer posted stronger numbers in ERA (4.7 vs 8.25) and home runs allowed (1.17 per nine innings vs 1.88). By the career numbers, Mark Mercer 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.