John Butcher vs. Izzy Leon — Career Comparison

On the career pitching numbers, John Butcher posted a stronger line than Izzy Leon. John Butcher posted stronger numbers in ERA (4.42 vs 5.35) and WHIP (1.414 vs 1.759). By the career numbers, John Butcher 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.