Robin Roberts vs. Joe Willis — Career Comparison

Looking at the career totals, Robin Roberts and Joe Willis are fairly close on the surface numbers. Robin Roberts posted stronger numbers in ERA (3.41 vs 4.63) and WHIP (1.184 vs 1.568). Joe Willis had the advantage in home runs allowed (0.17 per nine innings vs 0.97). By the career numbers, Robin Roberts 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.