Tom Knowlson vs. Jim Umbarger — Career Comparison

Looking at the career totals, Tom Knowlson and Jim Umbarger are fairly close on the surface numbers. Tom Knowlson posted stronger numbers in ERA (3.49 vs 4.14) and home runs allowed (0.09 per nine innings vs 0.69). Jim Umbarger had the advantage in WHIP (1.520 vs 1.579). By the career numbers, Tom Knowlson 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.