R. J. Alvarez vs. Unknown Nelson — Career Comparison

Looking at the career totals, R. J. Alvarez and Unknown Nelson are fairly close on the surface numbers. R. J. Alvarez posted stronger numbers in ERA (7.71 vs 9) and WHIP (1.879 vs 2.000). Unknown Nelson had the advantage in home runs allowed (0 per nine innings vs 2.67). By the career numbers, R. J. Alvarez 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.