Big Jeff Pfeffer played 6 seasons for the Rustlers and Cubs. He had 31 wins, 39 losses, an ERA of 3.30 and 317 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 |  | B. Jeff Pfeffer | 1905 |  CHC | 15 | 4 | 4 | .500 | 11 | 2.50 | 56 | 9 | 0 | 0 | 101.0 | 84 | 28 | 36 | 2 | 36 | 4 | 4 | 390 | 4 | 4.99 | 3.21 | 1.56 | 0.18 | 14.4 | 9.2 | 1.19 | .281 | 3.21 | 84 | 2.86 | 99 | 7.49 | 0.3 | |
| 2 | | B. Jeff Pfeffer | 1906 |  BSN | 36 | 13 | 22 | .371 | 36 | 2.95 | 158 | 33 | 4 | 0 | 302.1 | 270 | 99 | 138 | 4 | 114 | 16 | 0 | 1,229 | 3 | 4.70 | 3.39 | 1.39 | 0.12 | 12.9 | 9.3 | 1.27 | .284 | 4.11 | 111 | 2.78 | 101 | 8.04 | -0.4 | |
| 3 | | B. Jeff Pfeffer | 1907 |  BSN | 19 | 6 | 8 | .429 | 16 | 3.00 | 65 | 12 | 1 | 0 | 144.0 | 129 | 48 | 62 | 3 | 61 | 7 | 1 | 577 | 2 | 4.06 | 3.81 | 1.07 | 0.19 | 11.3 | 10.6 | 1.32 | .286 | 3.88 | 121 | 2.96 | 112 | 8.06 | -4.7 | |
| 4 | | B. Jeff Pfeffer | 1908 | BSN | 4 | 0 | 0 | 0 | 12.60 | 3 | 0 | 0 | 0 | 10.0 | 18 | 14 | 16 | 1 | 8 | 0 | 3 | 55 | 0 | 2.70 | 7.20 | 0.38 | 0.90 | 5.5 | 14.5 | 2.60 | .395 | 14.40 | 517 | 5.20 | 201 | 16.20 | -2.7 | ||
| 5 | | B. Jeff Pfeffer | 1910 |  CHC | 13 | 1 | 0 | 1.000 | 1 | 3.27 | 11 | 1 | 0 | 0 | 41.1 | 43 | 15 | 31 | 1 | 16 | 1 | 10 | 170 | 1 | 2.40 | 3.48 | 0.69 | 0.22 | 6.5 | 9.4 | 1.43 | .298 | 6.75 | 109 | 3.34 | 114 | 9.36 | -2 | |
| 6 | | B. Jeff Pfeffer | 1911 |  BSN | 26 | 7 | 5 | .583 | 6 | 4.73 | 24 | 4 | 1 | 2 | 97.0 | 116 | 51 | 74 | 3 | 57 | 0 | 16 | 442 | 1 | 2.23 | 5.29 | 0.42 | 0.28 | 5.4 | 12.9 | 1.78 | .316 | 6.87 | 132 | 4.44 | 118 | 10.76 | -6.3 | |
| Total | 113 | 31 | 39 | .443 | 70 | 3.30 | 317 | 59 | 6 | 2 | 695.2 | 660 | 255 | 357 | 14 | 292 | 28 | 34 | 2,863 | 11 | 4.10 | 3.78 | 1.09 | 0.18 | 11.1 | 10.2 | 1.37 | .292 | 4.62 | 118 | 3.13 | 107 | 8.54 | -15.9 |
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