Les Sweetland has the highest ERA with 150.0+ innings pitched in a season, with an ERA of 7.71 in 1930.
- Regular season
| NAME | ERA | IP | SEASON | TM | G | W | L | W% | GS | SO | CG | SHO | SV | 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 |  | L. Sweetland | 7.71 | 167.0 | 1930 | 34 | 7 | 15 | .318 | 25 | 36 | 8 | 1 | 0 | 271 | 143 | 164 | 24 | 60 | 5 | 5 | 817 | 0 | 1.94 | 3.23 | 0.60 | 1.29 | 4.4 | 7.3 | 1.98 | .357 | 8.84 | 141 | 6.11 | 113 | 14.60 | -10.3 | ||
| 2 | | W. Rotes | 7.60 | 151.2 | 1893 | 20 | 5 | 12 | .294 | 19 | 22 | 17 | 0 | 0 | 244 | 128 | 173 | 10 | 66 | 10 | 1 | 769 | 1 | 1.31 | 3.92 | 0.33 | 0.59 | 2.9 | 8.6 | 2.04 | .354 | 10.27 | 170 | 5.31 | 119 | 14.48 | -16.2 | ||
| 3 | | J. Wadsworth | 7.60 | 173.0 | 1894 | 22 | 4 | 18 | .182 | 22 | 57 | 20 | 0 | 0 | 261 | 146 | 204 | 10 | 103 | 4 | 0 | 866 | 13 | 2.97 | 5.36 | 0.55 | 0.52 | 6.6 | 11.9 | 2.10 | .363 | 10.61 | 149 | 5.76 | 113 | 13.58 | -14.9 | ||
| 4 | | C. Willoughby | 7.59 | 153.0 | 1930 | 41 | 4 | 17 | .190 | 24 | 38 | 5 | 1 | 1 | 241 | 129 | 147 | 17 | 68 | 2 | 8 | 744 | 3 | 2.24 | 4.00 | 0.56 | 1.00 | 5.1 | 9.1 | 2.02 | .362 | 8.65 | 139 | 5.82 | 108 | 14.18 | -5 | ||
| 5 | | J. Walkup | 7.36 | 150.1 | 1937 | 27 | 9 | 12 | .429 | 18 | 46 | 6 | 0 | 0 | 218 | 123 | 127 | 16 | 83 | 0 | 4 | 720 | 8 | 2.75 | 4.97 | 0.55 | 0.96 | 6.4 | 11.5 | 2.00 | .351 | 7.60 | 152 | 5.47 | 115 | 13.05 | -10.7 | ||
| 6 | | J. Knott | 7.29 | 192.2 | 1936 | 47 | 9 | 17 | .346 | 23 | 60 | 9 | 0 | 6 | 272 | 156 | 174 | 15 | 93 | 4 | 16 | 929 | 11 | 2.80 | 4.34 | 0.65 | 0.70 | 6.5 | 10.0 | 1.89 | .339 | 8.13 | 138 | 5.16 | 102 | 12.71 | -1.5 | ||
| 7 | | T. Colcolough | 7.23 | 150.2 | 1894 | 23 | 8 | 5 | .615 | 14 | 29 | 11 | 0 | 0 | 213 | 121 | 147 | 5 | 72 | 5 | 8 | 724 | 7 | 1.73 | 4.30 | 0.40 | 0.30 | 4.0 | 9.9 | 1.89 | .339 | 8.78 | 140 | 5.39 | 104 | 12.72 | -5.1 | ||
| 8 | | J. Fassero | 7.20 | 156.1 | 1999 | TOT | 37 | 5 | 14 | .263 | 27 | 114 | 0 | 0 | 0 | 208 | 125 | 135 | 35 | 83 | 4 | 2 | 3 | 751 | 9 | 6.56 | 4.78 | 1.37 | 2.01 | 15.2 | 11.1 | 1.86 | .336 | 7.77 | 153 | 6.24 | 133 | 11.97 | -27.3 |
| 9 | | J. Lima | 6.99 | 168.2 | 2005 | 32 | 5 | 16 | .238 | 32 | 80 | 1 | 0 | 0 | 219 | 131 | 140 | 31 | 61 | 9 | 0 | 1 | 780 | 5 | 4.27 | 3.25 | 1.31 | 1.65 | 10.3 | 7.8 | 1.66 | .314 | 7.47 | 156 | 5.70 | 132 | 11.69 | -25.8 | |
| 10 | | D. Cone | 6.91 | 155.0 | 2000 | 30 | 4 | 14 | .222 | 29 | 120 | 0 | 0 | 0 | 192 | 119 | 124 | 25 | 82 | 9 | 0 | 3 | 733 | 11 | 6.97 | 4.76 | 1.46 | 1.45 | 16.4 | 11.2 | 1.77 | .336 | 7.20 | 144 | 5.44 | 113 | 11.15 | -10.5 | |
| 11 | | F. Bates | 6.90 | 161.2 | 1899 | TOT | 22 | 1 | 18 | .053 | 19 | 13 | 17 | 0 | 0 | 246 | 124 | 183 | 6 | 110 | 23 | 3 | 839 | 5 | 0.72 | 6.12 | 0.12 | 0.33 | 1.5 | 13.1 | 2.20 | .349 | 10.19 | 179 | 5.73 | 149 | 13.69 | -33.8 | |
| 12 | | H. Staley | 6.81 | 208.2 | 1894 | 27 | 12 | 10 | .545 | 21 | 32 | 18 | 0 | 1 | 305 | 158 | 204 | 15 | 61 | 5 | 6 | 972 | 4 | 1.38 | 2.63 | 0.52 | 0.65 | 3.3 | 6.3 | 1.75 | .338 | 8.80 | 122 | 5.39 | 96 | 13.15 | 7.1 | ||
| 13 | | L. Hawkins | 6.66 | 174.1 | 1999 | 33 | 10 | 14 | .417 | 33 | 103 | 1 | 0 | 0 | 238 | 129 | 136 | 29 | 60 | 1 | 0 | 2 | 803 | 9 | 5.32 | 3.10 | 1.72 | 1.50 | 12.8 | 7.5 | 1.71 | .343 | 7.02 | 133 | 5.15 | 109 | 12.29 | -8.1 | |
| 14 | | J. Lima | 6.65 | 196.1 | 2000 | 33 | 7 | 16 | .304 | 33 | 124 | 0 | 0 | 0 | 251 | 145 | 152 | 48 | 68 | 2 | 0 | 3 | 895 | 3 | 5.68 | 3.12 | 1.82 | 2.20 | 13.9 | 7.6 | 1.62 | .311 | 6.97 | 138 | 6.11 | 129 | 11.51 | -29.2 | |
| 15 | | C. Dean | 6.61 | 159.1 | 1940 | 30 | 6 | 13 | .316 | 19 | 38 | 8 | 1 | 1 | 220 | 117 | 136 | 21 | 63 | 0 | 8 | 754 | 5 | 2.15 | 3.56 | 0.60 | 1.19 | 5.0 | 8.4 | 1.78 | .315 | 7.68 | 149 | 5.26 | 121 | 12.43 | -16.1 | ||
| 16 | | D. Kile | 6.61 | 190.2 | 1999 | 32 | 8 | 13 | .381 | 32 | 116 | 1 | 0 | 0 | 225 | 140 | 150 | 33 | 109 | 6 | 0 | 5 | 888 | 13 | 5.48 | 5.15 | 1.06 | 1.56 | 13.1 | 12.3 | 1.75 | .308 | 7.08 | 119 | 5.97 | 117 | 10.62 | -16.2 | |
| 17 | | N. Potter | 6.60 | 196.1 | 1939 | 41 | 8 | 12 | .400 | 25 | 60 | 9 | 0 | 2 | 258 | 144 | 163 | 26 | 88 | 5 | 12 | 922 | 12 | 2.75 | 4.03 | 0.68 | 1.19 | 6.5 | 9.5 | 1.76 | .312 | 7.47 | 143 | 5.50 | 124 | 11.83 | -22.9 | ||
| 18 | | T. Mullane | 6.59 | 155.2 | 1894 | TOT | 25 | 7 | 11 | .389 | 19 | 46 | 12 | 0 | 4 | 201 | 114 | 152 | 7 | 100 | 7 | 6 | 756 | 12 | 2.66 | 5.78 | 0.46 | 0.40 | 6.1 | 13.2 | 1.93 | .326 | 8.79 | 121 | 5.87 | 108 | 11.62 | -6.3 | |
| 19 | | E. Wingard | 6.56 | 156.1 | 1927 | 38 | 2 | 13 | .133 | 17 | 28 | 7 | 0 | 0 | 213 | 114 | 132 | 7 | 79 | 2 | 11 | 738 | 8 | 1.61 | 4.55 | 0.35 | 0.40 | 3.8 | 10.7 | 1.87 | .331 | 7.60 | 153 | 4.80 | 113 | 12.26 | -8.5 | ||
| 20 | | G. Caster | 6.56 | 178.1 | 1940 | 36 | 4 | 19 | .174 | 24 | 75 | 11 | 0 | 2 | 234 | 130 | 160 | 18 | 69 | 3 | 8 | 835 | 3 | 3.79 | 3.48 | 1.09 | 0.91 | 9.0 | 8.3 | 1.70 | .322 | 8.07 | 148 | 4.52 | 104 | 11.81 | -3.5 | ||
| 21 | | G. Keefe | 6.52 | 196.0 | 1890 | 25 | 6 | 16 | .273 | 22 | 55 | 22 | 0 | 0 | 280 | 142 | 229 | 11 | 138 | 5 | 3 | 1,014 | 13 | 2.53 | 6.34 | 0.40 | 0.51 | 5.4 | 13.6 | 2.13 | .334 | 10.52 | 157 | 5.27 | 128 | 12.86 | -26.7 | ||
| 22 | | S. Stratton | 6.51 | 171.1 | 1894 | TOT | 23 | 9 | 10 | .474 | 18 | 27 | 16 | 0 | 0 | 277 | 124 | 181 | 8 | 55 | 6 | 4 | 832 | 5 | 1.42 | 2.89 | 0.49 | 0.42 | 3.2 | 6.6 | 1.94 | .365 | 9.51 | 121 | 5.17 | 96 | 14.55 | 5.3 | |
| 23 | | B. Kissinger | 6.51 | 152.0 | 1895 | TOT | 26 | 5 | 12 | .294 | 16 | 34 | 10 | 0 | 0 | 240 | 110 | 156 | 8 | 53 | 8 | 10 | 742 | 3 | 2.01 | 3.14 | 0.64 | 0.47 | 4.6 | 7.1 | 1.93 | .363 | 9.24 | 138 | 5.02 | 106 | 14.21 | -5.3 | |
| 24 | | K. Schrom | 6.50 | 153.2 | 1987 | 32 | 6 | 13 | .316 | 29 | 61 | 4 | 1 | 0 | 185 | 111 | 126 | 29 | 57 | 3 | 0 | 1 | 695 | 4 | 3.57 | 3.34 | 1.07 | 1.70 | 8.8 | 8.2 | 1.57 | .286 | 7.38 | 144 | 5.69 | 128 | 10.84 | -21 | |
| 25 | | M. Sullivan | 6.48 | 208.1 | 1894 | TOT | 33 | 8 | 15 | .348 | 23 | 40 | 20 | 0 | 1 | 294 | 150 | 216 | 14 | 121 | 11 | 8 | 1,026 | 15 | 1.73 | 5.23 | 0.33 | 0.60 | 3.9 | 11.8 | 1.99 | .333 | 9.33 | 120 | 6.21 | 115 | 12.70 | -18 | |
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