Between the 1930 and 1950 seasons, George Earnshaw had the lowest ERA with 25.0+ innings pitched in a postseason, with an ERA of 0.72 in 1930.
| NAME | ERA | IP | SEASON | TM | G | W | L | W% | GS | SO | CG | SHO | SV | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | G. Earnshaw | 0.72 | 25.0 | 1930 |  PHA | 3 | 2 | 0 | 1.000 | 3 | 19 | 2 | 0 | 0 | 13 | 2 | 2 | 1 | 7 | 0 | 0 | 1 | 95 | 0 | 6.84 | 2.52 | 2.71 | 0.36 | 20.0 | 7.4 | 0.80 | .176 | 0.72 | 4.68 | ||||
| 2 |  | B. Newsom | 1.38 | 26.0 | 1940 |  DET | 3 | 2 | 1 | .667 | 3 | 17 | 3 | 1 | 0 | 18 | 4 | 4 | 0 | 4 | 0 | 0 | 1 | 97 | 0 | 5.88 | 1.38 | 4.25 | 0.00 | 17.5 | 4.1 | 0.85 | .237 | 1.38 | 6.23 | ||||
| 3 |  | D. Dean | 1.73 | 26.0 | 1934 |  SLN | 3 | 2 | 1 | .667 | 3 | 17 | 2 | 1 | 0 | 20 | 5 | 6 | 2 | 5 | 1 | 0 | 0 | 103 | 0 | 5.88 | 1.73 | 3.40 | 0.69 | 16.5 | 4.9 | 0.96 | .231 | 2.08 | 6.92 | ||||
| 4 | | L. Grove | 2.42 | 26.0 | 1931 | PHA | 3 | 2 | 1 | .667 | 3 | 16 | 2 | 0 | 0 | 28 | 7 | 7 | 0 | 2 | 0 | 0 | 0 | 107 | 0 | 5.54 | 0.69 | 8.00 | 0.00 | 15.0 | 1.9 | 1.15 | .315 | 2.42 | 9.69 |
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