Mark Leiter vs. Stan Spencer — Career Comparison

On the career pitching numbers, Mark Leiter posted a stronger line than Stan Spencer. Mark Leiter posted stronger numbers in ERA (4.57 vs 5.54) and home runs allowed (1.18 per nine innings vs 1.74). By the career numbers, Mark Leiter 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.