Jim Peterson vs. Greg Thayer — Career Comparison

Looking at the career totals, Jim Peterson and Greg Thayer are fairly close on the surface numbers. Greg Thayer posted stronger numbers in ERA (3.8 vs 5.27) and WHIP (1.578 vs 1.665). Jim Peterson had the advantage in home runs allowed (0.74 per nine innings vs 1). By the career numbers, Greg Thayer 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.