Luis Guerrero vs. Willis Roberts — Career Comparison

On the career pitching numbers, Luis Guerrero posted a stronger line than Willis Roberts. Luis Guerrero posted stronger numbers in ERA (2.63 vs 4.64) and WHIP (1.134 vs 1.521). By the career numbers, Luis Guerrero 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.