Robbie Erlin vs. Tom Knowlson — Career Comparison

Looking at the career totals, Robbie Erlin and Tom Knowlson are fairly close on the surface numbers. Tom Knowlson posted stronger numbers in ERA (3.49 vs 4.87) and home runs allowed (0.09 per nine innings vs 1.13). Robbie Erlin had the advantage in WHIP (1.297 vs 1.579). By the career numbers, Tom Knowlson 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.