Don Brennan vs. Mason Thompson — Career Comparison

On the career pitching numbers, Don Brennan posted a stronger line than Mason Thompson. Don Brennan posted stronger numbers in ERA (4.19 vs 5.21) and WHIP (1.552 vs 1.667). 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.