John Clarkson vs. Michael Petersen — Career Comparison

On the career pitching numbers, John Clarkson posted a stronger line than Michael Petersen. John Clarkson posted stronger numbers in ERA (2.81 vs 5.02) and WHIP (1.209 vs 1.593). By the career numbers, John Clarkson 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.