Oswaldo Mairena vs. Lou Polli — Career Comparison

Looking at the career totals, Oswaldo Mairena and Lou Polli are fairly close on the surface numbers. Lou Polli posted stronger numbers in ERA (4.68 vs 6.06) and home runs allowed (0.64 per nine innings vs 2.02). Oswaldo Mairena had the advantage in WHIP (1.654 vs 1.843). By the career numbers, Lou Polli 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.