Frank Killen vs. Mike Thomas — Career Comparison

Looking at the career totals, Frank Killen and Mike Thomas are fairly close on the surface numbers. Mike Thomas posted stronger numbers in ERA (0 vs 3.78) and home runs allowed (0 per nine innings vs 0.2). Frank Killen had the advantage in WHIP (1.414 vs 2.250). By the career numbers, Mike Thomas 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.