David Aardsma vs. Tyler Robertson — Career Comparison

On the career pitching numbers, David Aardsma posted a stronger line than Tyler Robertson. David Aardsma posted stronger numbers in ERA (4.27 vs 5.54) and home runs allowed (1.09 per nine innings vs 1.73). By the career numbers, David Aardsma 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.