Mike Duvall vs. Michael Petersen — Career Comparison

Looking at the career totals, Mike Duvall and Michael Petersen are fairly close on the surface numbers. Mike Duvall posted stronger numbers in ERA (4.76 vs 5.02) and home runs allowed (1.06 per nine innings vs 1.43). Michael Petersen had the advantage in WHIP (1.593 vs 1.863). By the career numbers, Mike Duvall 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.