John Foster vs. Willie Hernandez — Career Comparison

On the career pitching numbers, Willie Hernandez posted a stronger line than John Foster. Willie Hernandez posted stronger numbers in ERA (3.38 vs 4.9) and WHIP (1.321 vs 1.615). By the career numbers, Willie Hernandez 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.