Andrew Miller vs. Ryan O'Rourke — Career Comparison

On the career pitching numbers, Andrew Miller posted a stronger line than Ryan O'Rourke. Andrew Miller posted stronger numbers in ERA (4.03 vs 4.84) and home runs allowed (0.87 per nine innings vs 1.12). By the career numbers, Andrew Miller 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.