What Johnny Mize's 1939 Season Would Look Like in 1987
What would Johnny Mize's 1939 season look like if he hit in 1987 instead? Below, his real 1939 line sits beside a cross-era translation into 1987's run environment — and a live slider lets you drop that season into any year in MLB history.
Johnny Mize — 1939 (real)
Translated to 1987
Why the translated line looks better: 1987 was a higher-offense run environment than 1939 (league OPS .735 → .747), so every hitter's raw line scales up. It does not mean Johnny Mize would hit better against modern pitching — it is the same hitter re-based to a livelier league.
What this translation does not account for
This is a model, not a prediction. It re-expresses only Johnny Mize's rate stats against 1987's league run environment — and nothing else. It does not account for the depth of competition (integration, international talent, a vastly larger athlete pool), pitch velocity, modern pitch arsenals (sliders, splitters, sweepers), strength and conditioning, or in-game adjustments and advanced scouting.
So a higher translated line means 1987 was simply a higher-offense era — not a claim that Johnny Mize would actually perform better against today's pitching.
Rate Stats: Real vs. Translated
These rate stats are re-expressed by holding Johnny Mize's performance relative to his league constant and re-basing it on 1987's averages (the same idea behind OPS+/ERA+).
| Stat | 1939 (real) | 1987 (modeled) |
|---|---|---|
| AVG | .349 | .335 |
| OBP | .444 | .430 |
| SLG | .626 | .662 |
| OPS | 1.070 | 1.091 |
Counting Stats (1939, as played)
| Games | 153 |
| At-Bats | 564 |
| Hits | 197 |
| Home Runs | 28 |
| RBI | 108 |
| Runs | 104 |
| Walks | 92 |
| Stolen Bases | 0 |
Why counting totals aren't translated: scaling a counting stat by the league environment ratio massively over-inflates era outliers — e.g. a 1920s slugger's home runs would balloon to absurd modern totals. So home runs, RBI, wins, strikeouts and the like are shown exactly as Johnny Mize produced them.
Verdict
This is a model, not a prediction. In 1987, a sudden league-wide home-run spike — a run environment friendlier to hitters than 1939's (league OPS .735 → .747) — one reasoned way to express Johnny Mize's 1939 season is roughly .335/.430/.662 with a 1.091 OPS. That figure holds his performance relative to his league constant and re-bases it on 1987's averages; it is not a claim that Johnny Mize would actually post that line. His counting totals (28 HR, 108 RBI) are shown exactly as he played them, because scaling counting stats across eras wildly inflates outliers.
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Johnny Mize in Other Eras
View Johnny Mize's full profile → · Browse all era translations →