Mike Armstrong vs. Frank Keffer — Career Comparison

Looking at the career totals, Mike Armstrong and Frank Keffer are fairly close on the surface numbers. Mike Armstrong posted stronger numbers in ERA (4.1 vs 5.63) and WHIP (1.405 vs 1.500). Frank Keffer had the advantage in home runs allowed (0 per nine innings vs 1.12). By the career numbers, Mike Armstrong 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.