John Anderson vs. Kenley Jansen — Career Comparison

On the career pitching numbers, Kenley Jansen posted a stronger line than John Anderson. Kenley Jansen posted stronger numbers in ERA (2.57 vs 6.45) and WHIP (0.983 vs 1.813). By the career numbers, Kenley Jansen 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.