Jack Russell vs. Jordan Zimmermann — Career Comparison

Looking at the career totals, Jack Russell and Jordan Zimmermann are fairly close on the surface numbers. Jordan Zimmermann posted stronger numbers in ERA (4.07 vs 4.46) and WHIP (1.258 vs 1.475). Jack Russell had the advantage in home runs allowed (0.36 per nine innings vs 1.09). By the career numbers, Jordan Zimmermann 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.