Gil Heredia played 10 seasons for 4 teams, including the Athletics and Expos. He had 57 wins, 51 losses, an ERA of 4.46 and 547 strikeouts.
| 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 |  | G. Heredia | 1991 | 7 | 0 | 2 | .000 | 4 | 3.82 | 13 | 0 | 0 | 0 | 33.0 | 27 | 14 | 14 | 4 | 7 | 0 | 1 | 2 | 126 | 1 | 3.55 | 1.91 | 1.86 | 1.09 | 10.3 | 5.6 | 1.03 | .225 | 3.82 | 108 | 4.27 | 115 | 7.36 | -2.1 | |
| 2 | | G. Heredia | 1992 | TOT | 20 | 2 | 3 | .400 | 5 | 4.23 | 22 | 0 | 0 | 0 | 44.2 | 44 | 21 | 23 | 4 | 20 | 1 | 4 | 1 | 187 | 1 | 4.43 | 4.03 | 1.10 | 0.81 | 11.8 | 10.7 | 1.43 | .286 | 4.63 | 124 | 4.36 | 125 | 8.87 | -4.4 |
| 3 | | G. Heredia | 1993 | 20 | 4 | 2 | .667 | 9 | 3.92 | 40 | 1 | 0 | 2 | 57.1 | 66 | 25 | 28 | 4 | 14 | 2 | 2 | 2 | 246 | 0 | 6.28 | 2.20 | 2.86 | 0.63 | 16.3 | 5.7 | 1.40 | .333 | 4.40 | 98 | 3.33 | 84 | 10.36 | 4.1 | |
| 4 | | G. Heredia | 1994 | 39 | 6 | 3 | .667 | 3 | 3.46 | 62 | 0 | 0 | 0 | 75.1 | 85 | 29 | 34 | 7 | 13 | 2 | 8 | 3 | 325 | 4 | 7.41 | 1.55 | 4.77 | 0.84 | 19.1 | 4.0 | 1.30 | .324 | 4.06 | 81 | 3.28 | 78 | 10.15 | 8 | |
| 5 | | G. Heredia | 1995 | 40 | 5 | 6 | .455 | 18 | 4.31 | 74 | 0 | 0 | 1 | 119.0 | 137 | 57 | 60 | 7 | 21 | 5 | 5 | 1 | 509 | 1 | 5.60 | 1.59 | 3.52 | 0.53 | 14.5 | 4.1 | 1.33 | .323 | 4.54 | 102 | 3.27 | 78 | 10.36 | 11.9 | |
| 6 | | G. Heredia | 1996 | 44 | 2 | 5 | .286 | 0 | 5.89 | 43 | 0 | 0 | 1 | 73.1 | 91 | 48 | 50 | 12 | 14 | 1 | 21 | 2 | 320 | 2 | 5.28 | 1.72 | 3.07 | 1.47 | 13.4 | 4.4 | 1.43 | .316 | 6.14 | 115 | 4.73 | 96 | 11.17 | 1.5 | |
| 7 | | G. Heredia | 1998 | 8 | 3 | 3 | .500 | 6 | 2.74 | 27 | 0 | 0 | 0 | 42.2 | 43 | 13 | 14 | 4 | 3 | 3 | 2 | 0 | 175 | 0 | 5.70 | 0.63 | 9.00 | 0.84 | 15.4 | 1.7 | 1.08 | .283 | 2.95 | 60 | 3.51 | 78 | 9.07 | 4.8 | |
| 8 | | G. Heredia | 1999 | 33 | 13 | 8 | .619 | 33 | 4.81 | 117 | 1 | 0 | 0 | 200.1 | 228 | 107 | 119 | 22 | 34 | 8 | 0 | 4 | 852 | 2 | 5.26 | 1.53 | 3.44 | 0.99 | 13.7 | 4.0 | 1.31 | .307 | 5.35 | 101 | 4.01 | 84 | 10.24 | 17.4 | |
| 9 | | G. Heredia | 2000 | 32 | 15 | 11 | .577 | 32 | 4.12 | 101 | 2 | 0 | 0 | 198.2 | 214 | 91 | 106 | 24 | 66 | 4 | 0 | 5 | 860 | 3 | 4.58 | 2.99 | 1.53 | 1.09 | 11.7 | 7.7 | 1.41 | .286 | 4.80 | 86 | 4.74 | 99 | 9.69 | 0.8 | |
| 10 | | G. Heredia | 2001 | 24 | 7 | 8 | .467 | 18 | 5.58 | 48 | 0 | 0 | 0 | 109.2 | 144 | 68 | 75 | 27 | 29 | 2 | 2 | 3 | 493 | 1 | 3.94 | 2.38 | 1.66 | 2.22 | 9.7 | 5.9 | 1.58 | .302 | 6.16 | 127 | 6.22 | 140 | 11.82 | -21.8 | |
| Total | 267 | 57 | 51 | .528 | 128 | 4.46 | 547 | 4 | 0 | 4 | 954.0 | 1,079 | 473 | 523 | 115 | 221 | 28 | 45 | 23 | 4,093 | 15 | 5.16 | 2.08 | 2.48 | 1.08 | 13.4 | 5.4 | 1.36 | .303 | 4.93 | 100 | 4.28 | 96 | 10.18 | 20.2 |
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