Bruce Chen vs. Don Kaiser — Career Comparison

On the career pitching numbers, Don Kaiser posted a stronger line than Bruce Chen. Don Kaiser posted stronger numbers in ERA (4.15 vs 4.62) and home runs allowed (0.79 per nine innings vs 1.51). By the career numbers, Don Kaiser 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.