Ethan Roberts vs. Ryan Zeferjahn — Career Comparison

On the career pitching numbers, Ryan Zeferjahn posted a stronger line than Ethan Roberts. Ryan Zeferjahn posted stronger numbers in ERA (4.14 vs 4.98) and WHIP (1.365 vs 1.592). By the career numbers, Ryan Zeferjahn 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.