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| Name | W | L | SV | ERA | G | GS | IP | HA | R | ER | HR | BB | K | WHIP | OAVG | BABIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ad Brennan SP | 24 | 12 | 0 | 1.79 | 38 | 38 | 322.0 | 243 | 84 | 64 | 3 | 71 | 140 | 0.98 | .211 | .236 | 7.4 |
| Christy Mathewson SP | 21 | 15 | 0 | 2.29 | 39 | 39 | 306.1 | 258 | 108 | 78 | 5 | 50 | 143 | 1.01 | .227 | .254 | 7.3 |
| John Taff CL | 4 | 1 | 18 | 2.64 | 40 | 0 | 47.2 | 44 | 16 | 14 | 0 | 23 | 22 | 1.41 | .246 | .280 | 0.5 |
| Lefty Tyler SP | 17 | 18 | 0 | 2.82 | 40 | 39 | 303.0 | 283 | 129 | 95 | 2 | 119 | 118 | 1.33 | .249 | .275 | 4.3 |
| Jim Shaw RP | 6 | 5 | 0 | 2.92 | 17 | 11 | 83.1 | 72 | 39 | 27 | 1 | 50 | 38 | 1.46 | .232 | .260 | 0.1 |
| Slim Sallee RP | 0 | 1 | 0 | 3.00 | 3 | 0 | 9.0 | 10 | 5 | 3 | 0 | 1 | 4 | 1.22 | .286 | .323 | 0.3 |
| Phifer Fullenwider SP | 2 | 2 | 0 | 3.45 | 4 | 4 | 28.2 | 33 | 15 | 11 | 0 | 17 | 11 | 1.74 | .295 | .327 | 0.2 |
| Ed Reulbach RP | 2 | 2 | 2 | 3.58 | 39 | 0 | 60.1 | 68 | 37 | 24 | 1 | 22 | 24 | 1.49 | .292 | .322 | 0.0 |
| Frank Browning RP | 4 | 11 | 0 | 4.26 | 17 | 17 | 122.2 | 147 | 72 | 58 | 2 | 51 | 35 | 1.61 | .308 | .327 | 0.7 |
| Jimmy Agnew RP | 1 | 2 | 0 | 4.56 | 4 | 3 | 23.2 | 28 | 16 | 12 | 0 | 3 | 6 | 1.31 | .275 | .292 | 0.5 |
| Lou Fiene RP | 0 | 2 | 2 | 5.06 | 13 | 2 | 42.2 | 45 | 27 | 24 | 1 | 26 | 23 | 1.66 | .265 | .301 | -0.1 |
| Frank Lange SP | 0 | 1 | 0 | 8.31 | 1 | 1 | 4.1 | 3 | 7 | 4 | 0 | 7 | 2 | 2.31 | .188 | .200 | -0.2 |
