Unknown Atkinson vs. Zach McClellan — Career Comparison

On the career pitching numbers, Unknown Atkinson posted a stronger line than Zach McClellan. Unknown Atkinson posted stronger numbers in ERA (4.5 vs 5.79) and WHIP (1.000 vs 1.929). By the career numbers, Unknown Atkinson 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.