Andy Boswell vs. Francisco de la Rosa — Career Comparison

On the career pitching numbers, Francisco de la Rosa posted a stronger line than Andy Boswell. Francisco de la Rosa posted stronger numbers in ERA (4.5 vs 5.91) and home runs allowed (0 per nine innings vs 0.28). By the career numbers, Francisco de la Rosa 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.