Adam Peterson vs. Frank Viola — Career Comparison

On the career pitching numbers, Frank Viola posted a stronger line than Adam Peterson. Frank Viola posted stronger numbers in ERA (3.73 vs 5.46) and WHIP (1.315 vs 1.516). By the career numbers, Frank Viola 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.