J.A. Happ had a record of 1-4 with an ERA of 5.86 and 26 strikeouts in 15 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.A. Happ | 2008 |  PHI | 1 | 0 | 0 | 0 | 3.00 | 2 | 0 | 0 | 0 | 3.0 | 4 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 13 | 0 | 6.00 | 6.00 | 1.00 | 0.00 | 15.4 | 15.4 | 2.00 | .444 | 3.00 | 12.00 | |||||
| 2 | | J.A. Happ | 2009 | PHI | 7 | 0 | 0 | 1 | 5.68 | 8 | 0 | 0 | 0 | 6.1 | 8 | 4 | 4 | 1 | 6 | 0 | 0 | 0 | 33 | 0 | 11.37 | 8.53 | 1.33 | 1.42 | 24.2 | 18.2 | 2.21 | .389 | 5.68 | 11.37 | |||||
| 3 |  | J.A. Happ | 2016 |  TOR | 2 | 1 | 1 | .500 | 2 | 2.70 | 9 | 0 | 0 | 0 | 10.0 | 13 | 3 | 3 | 1 | 2 | 0 | 0 | 0 | 45 | 1 | 8.10 | 1.80 | 4.50 | 0.90 | 20.0 | 4.4 | 1.50 | .364 | 2.70 | 11.70 | ||||
| 4 |  | J.A. Happ | 2018 |  NYY | 1 | 0 | 1 | .000 | 1 | 22.50 | 2 | 0 | 0 | 0 | 2.0 | 4 | 5 | 5 | 1 | 1 | 0 | 0 | 0 | 11 | 0 | 9.00 | 4.50 | 2.00 | 4.50 | 18.2 | 9.1 | 2.50 | .429 | 22.50 | 18.00 | ||||
| 5 | | J.A. Happ | 2019 | NYY | 3 | 0 | 1 | .000 | 0 | 2.45 | 3 | 0 | 0 | 0 | 3.2 | 2 | 1 | 1 | 1 | 2 | 0 | 1 | 0 | 15 | 0 | 7.36 | 4.91 | 1.50 | 2.45 | 20.0 | 13.3 | 1.09 | .111 | 2.45 | 4.91 | ||||
| 6 | | J.A. Happ | 2020 | NYY | 1 | 0 | 1 | .000 | 0 | 13.50 | 2 | 0 | 0 | 0 | 2.2 | 5 | 4 | 4 | 2 | 3 | 0 | 0 | 0 | 17 | 0 | 6.75 | 10.13 | 0.67 | 6.75 | 11.8 | 17.6 | 3.00 | .300 | 13.50 | 16.88 | ||||
| Total | 15 | 1 | 4 | .200 | 4 | 5.86 | 26 | 0 | 0 | 0 | 27.2 | 36 | 18 | 18 | 6 | 16 | 0 | 1 | 0 | 134 | 1 | 8.46 | 5.20 | 1.63 | 1.95 | 19.4 | 11.9 | 1.88 | .349 | 5.86 | 11.71 |
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