Frank Mack vs. Colin Selby — Career Comparison

Looking at the career totals, Frank Mack and Colin Selby are fairly close on the surface numbers. Frank Mack posted stronger numbers in ERA (4.94 vs 6.2) and home runs allowed (0.38 per nine innings vs 1.2). Colin Selby had the advantage in WHIP (1.556 vs 1.732). 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.