Jack O'Connor vs. John Perkovich — Career Comparison

Looking at the career totals, Jack O'Connor and John Perkovich are fairly close on the surface numbers. Jack O'Connor posted stronger numbers in ERA (4.89 vs 7.2) and home runs allowed (1.02 per nine innings vs 5.4). John Perkovich had the advantage in WHIP (1.600 vs 1.657). By the career numbers, Jack O'Connor 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.