John Purdin vs. Mark Williamson — Career Comparison

Looking at the career totals, John Purdin and Mark Williamson are fairly close on the surface numbers. Mark Williamson had the edge in home runs allowed (0.81 per nine innings vs 1.46). By the career numbers, Mark Williamson 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.