Frank Mountain vs. Willis Roberts — Career Comparison

On the career pitching numbers, Frank Mountain posted a stronger line than Willis Roberts. Frank Mountain posted stronger numbers in ERA (3.47 vs 4.64) and WHIP (1.301 vs 1.521). By the career numbers, Frank Mountain 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.