John McCloskey vs. Sean O'Sullivan — Career Comparison

On the career pitching numbers, John McCloskey posted a stronger line than Sean O'Sullivan. John McCloskey posted stronger numbers in ERA (3.6 vs 6.01) and WHIP (1.520 vs 1.616). By the career numbers, John McCloskey 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.