John Clarkson vs. Dae-Sung Koo — Career Comparison

On the career pitching numbers, John Clarkson posted a stronger line than Dae-Sung Koo. John Clarkson posted stronger numbers in ERA (2.81 vs 3.91) and WHIP (1.209 vs 1.565). 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.