Freddie Martinez vs. Sean O'Sullivan — Career Comparison

On the career pitching numbers, Freddie Martinez posted a stronger line than Sean O'Sullivan. Freddie Martinez posted stronger numbers in ERA (4.46 vs 6.01) and WHIP (1.410 vs 1.616). By the career numbers, Freddie Martinez 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.