Fernando Arroyo vs. William Brennan — Career Comparison

On the career pitching numbers, Fernando Arroyo posted a stronger line than William Brennan. Fernando Arroyo posted stronger numbers in ERA (4.44 vs 5.18) and WHIP (1.423 vs 1.849). By the career numbers, Fernando Arroyo 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.