John Duffie vs. Andy Sonnanstine — Career Comparison

Looking at the career totals, John Duffie and Andy Sonnanstine are fairly close on the surface numbers. John Duffie posted stronger numbers in ERA (2.79 vs 5.26) and home runs allowed (0.93 per nine innings vs 1.32). Andy Sonnanstine had the advantage in WHIP (1.414 vs 1.655). By the career numbers, John Duffie 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.