| SP | McDowell, S.McDowell, Sam † | Athletic Assoc | L | 157.0 | 30 | 30 | 19 | 6 | 3.40 | .292 | 1.22 | 7.1 | 3.9 | 7.6 | 243.2 | 192 | 101 | 92 | 23 | 105 | 205 | 12 | 0 | 0 | 2 | 17 | 4 | 4 | 3.89 |
| SP | Martinez, P.Martinez, Pedro # $ | Sox | R | 145.0 | 36 | 36 | 18 | 11 | 3.46 | .270 | 1.09 | 7.3 | 2.5 | 8.3 | 273.1 | 221 | 106 | 105 | 31 | 77 | 251 | 10 | 0 | 0 | 1 | 23 | 6 | 3 | 3.55 |
| SP | Arrieta, J.Arrieta, Jake † $ | Athletic Assoc | R | 143.0 | 34 | 34 | 19 | 9 | 2.91 | .270 | 1.10 | 7.0 | 2.9 | 7.3 | 219.1 | 171 | 73 | 71 | 14 | 71 | 177 | 1 | 0 | 0 | 1 | 29 | 1 | 7 | 3.20 |
| SP | Leonard, D.Leonard, Dutch † $ | Cats | L | 142.0 | 33 | 33 | 21 | 7 | 3.43 | .265 | 1.06 | 6.4 | 3.1 | 5.1 | 223.1 | 159 | 86 | 85 | 17 | 78 | 127 | 2 | 0 | 0 | 1 | 24 | 5 | 2 | 3.97 |
| CL | Street, H.Street, Huston † | Anakites | R | 131.5 | 62 | 0 | 4 | 5 | 2.83 | .270 | 1.09 | 4.8 | 5.1 | 9.6 | 60.1 | 32 | 22 | 19 | 4 | 34 | 64 | 0 | 43 | 5 | 0 | 0 | 1 | 0 | 3.48 |