Bill Hallahan had a 3-1 record with an ERA of 1.36, 27 strikeouts and 1 save in 7 appearances in the postseason in his career.
| NAME | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | 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 |  | B. Hallahan | 1926 |  SLN | 1 | 0 | 0 | 0 | 4.50 | 1 | 0 | 0 | 0 | 2.0 | 2 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 11 | 0 | 4.50 | 13.50 | 0.33 | 0.00 | 9.1 | 27.3 | 2.50 | .286 | 4.50 | 9.00 | |||||
| 2 | | B. Hallahan | 1930 | SLN | 2 | 1 | 1 | .500 | 2 | 1.64 | 8 | 1 | 1 | 0 | 11.0 | 9 | 2 | 2 | 0 | 8 | 1 | 0 | 0 | 50 | 0 | 6.55 | 6.55 | 1.00 | 0.00 | 16.0 | 16.0 | 1.55 | .273 | 1.64 | 7.36 | ||||
| 3 | | B. Hallahan | 1931 | SLN | 3 | 2 | 0 | 1.000 | 2 | 0.49 | 12 | 2 | 1 | 1 | 18.1 | 12 | 1 | 1 | 0 | 8 | 0 | 1 | 1 | 74 | 1 | 5.89 | 3.93 | 1.50 | 0.00 | 16.2 | 10.8 | 1.09 | .222 | 0.49 | 5.89 | ||||
| 4 | | B. Hallahan | 1934 | SLN | 1 | 0 | 0 | 1 | 2.16 | 6 | 0 | 0 | 0 | 8.1 | 6 | 2 | 2 | 0 | 4 | 0 | 0 | 0 | 37 | 0 | 6.48 | 4.32 | 1.50 | 0.00 | 16.2 | 10.8 | 1.20 | .222 | 2.16 | 6.48 | |||||
| Total | 7 | 3 | 1 | .750 | 5 | 1.36 | 27 | 3 | 2 | 1 | 39.2 | 29 | 6 | 6 | 0 | 23 | 1 | 1 | 1 | 172 | 1 | 6.13 | 5.22 | 1.17 | 0.00 | 15.7 | 13.4 | 1.31 | .240 | 1.36 | 6.58 |
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