John McPherson vs. Sean O'Sullivan — Career Comparison

On the career pitching numbers, John McPherson posted a stronger line than Sean O'Sullivan. John McPherson posted stronger numbers in ERA (3.89 vs 6.01) and WHIP (1.417 vs 1.616). By the career numbers, John McPherson 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.