Brad Keller vs. Unknown Warren — Career Comparison

Looking at the career totals, Brad Keller and Unknown Warren are fairly close on the surface numbers. Unknown Warren posted stronger numbers in ERA (0 vs 4.14) and home runs allowed (0 per nine innings vs 0.85). Brad Keller had the advantage in WHIP (1.414 vs 1.500). By the career numbers, Unknown Warren 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.