The most statistically extreme individual seasons in MLB history — each one measured only against its own season and position group, so a 1876 campaign and a 2026 campaign face the exact same test: how far did you stand above the league you actually played in?
Rankings as of 2026-09-30, as declared by the corpus that produced them.
How this is computed
each season's VAL scored against its OWN (season, position-group) peer distribution — robust z = (val − median) / (IQR/1.349), percentile via the standard normal CDF.
How many robust standard deviations the season sat above its own (season, position-group) median.
Showing 30 of 100 ranked entries.
The most extreme batters seasons, each against its own year's peer group.
Showing 25 of 25 ranked entries.
The most extreme pitchers seasons, each against its own year's peer group.
Showing 25 of 25 ranked entries.