Mark Johnson vs. Tom Seaver — Career Comparison

On the career pitching numbers, Tom Seaver posted a stronger line than Mark Johnson. Tom Seaver posted stronger numbers in ERA (2.86 vs 7.5) and WHIP (1.145 vs 1.750). By the career numbers, Tom Seaver 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.