Don Brennan vs. John Perkovich — Career Comparison

On the career pitching numbers, Don Brennan posted a stronger line than John Perkovich. Don Brennan posted stronger numbers in ERA (4.19 vs 7.2) and home runs allowed (0.32 per nine innings vs 5.4). By the career numbers, Don Brennan 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.