Frank Mack vs. Bill Popp — Career Comparison

Looking at the career totals, Frank Mack and Bill Popp are fairly close on the surface numbers. Frank Mack had the edge in WHIP (1.732 vs 1.873). By the career numbers, Frank Mack 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.