Frank Hafner vs. Aaron Scheffer — Career Comparison

On the career pitching numbers, Aaron Scheffer posted a stronger line than Frank Hafner. Aaron Scheffer posted stronger numbers in ERA (1.93 vs 7) and WHIP (1.929 vs 2.222). By the career numbers, Aaron Scheffer 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.