Mike Willis vs. Tony Zych — Career Comparison

On the career pitching numbers, Tony Zych posted a stronger line than Mike Willis. Tony Zych posted stronger numbers in ERA (2.72 vs 4.59) and WHIP (1.321 vs 1.524). By the career numbers, Tony Zych 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.