Jerry Koosman had a 4-0 record with an ERA of 3.79 and 31 strikeouts 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 |  | J. Koosman | 1969 |  NYM | 3 | 2 | 0 | 1.000 | 3 | 4.03 | 14 | 1 | 0 | 0 | 22.1 | 14 | 10 | 10 | 3 | 8 | 0 | 0 | 0 | 88 | 0 | 5.64 | 3.22 | 1.75 | 1.21 | 15.9 | 9.1 | 0.99 | .175 | 4.03 | 5.64 | ||||
| 2 | | J. Koosman | 1973 | NYM | 3 | 2 | 0 | 1.000 | 3 | 2.55 | 17 | 1 | 0 | 0 | 17.2 | 17 | 5 | 5 | 1 | 7 | 0 | 0 | 1 | 76 | 0 | 8.66 | 3.57 | 2.43 | 0.51 | 22.4 | 9.2 | 1.36 | .314 | 2.55 | 8.66 | ||||
| 3 |  | J. Koosman | 1983 |  CWS | 1 | 0 | 0 | 0 | 54.00 | 0 | 0 | 0 | 0 | 0.1 | 1 | 2 | 3 | 0 | 2 | 0 | 0 | 1 | 4 | 0 | 0.00 | 54.00 | 0.00 | 0.00 | 0.0 | 50.0 | 9.00 | .500 | 81.00 | 27.00 | |||||
| Total | 7 | 4 | 0 | 1.000 | 6 | 3.79 | 31 | 2 | 0 | 0 | 40.1 | 32 | 17 | 18 | 4 | 17 | 0 | 0 | 2 | 168 | 0 | 6.92 | 3.79 | 1.82 | 0.89 | 18.5 | 10.1 | 1.21 | .241 | 4.02 | 7.14 |
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