| SP | Schilling, C.Schilling, Curt >> | 38 | 2004 | R | 86 | 12 | 12 | 4 | 5 | 3.23 | .289 | 1.20 | 8.4 | 2.3 | 5.2 | 92.0 | 86 | 33 | 33 | 9 | 24 | 53 | 5 | 0 | 0 | 1 | 9 | 2 | 4 | 3.97 |
| SP | Martinez, P.Martinez, Pedro >> | 33 | 2004 | R | 75 | 11 | 11 | 6 | 4 | 3.40 | .301 | 1.28 | 8.6 | 3.0 | 8.4 | 76.2 | 73 | 32 | 29 | 8 | 25 | 71 | 1 | 0 | 0 | 0 | 7 | 1 | 2 | 3.53 |
| SP | Arroyo, B.Arroyo, Bronson >> | 27 | 2004 | R | 60 | 11 | 11 | 3 | 2 | 3.90 | .307 | 1.31 | 9.6 | 2.4 | 6.0 | 64.2 | 68 | 30 | 28 | 8 | 17 | 43 | 0 | 0 | 0 | 0 | 7 | 1 | 1 | 4.13 |
| SP | Wakefield, T.Wakefield, Tim >> | 38 | 2004 | R | 27 | 11 | 11 | 2 | 4 | 4.36 | .314 | 1.38 | 8.7 | 3.7 | 4.5 | 64.0 | 62 | 33 | 31 | 10 | 26 | 32 | 0 | 0 | 0 | 0 | 5 | 0 | 2 | 5.25 |
| RP | Foulke, K.Foulke, Keith >> | 32 | 2004 | R | 94 | 30 | 0 | 1 | 1 | 1.40 | .182 | 0.64 | 4.8 | 1.0 | 7.2 | 45.0 | 24 | 8 | 7 | 2 | 5 | 36 | 0 | 4 | 1 | 0 | 0 | 1 | 1 | 2.38 |
| RP | Mendoza, R.Mendoza, Ramiro >> | 32 | 2004 | R | 79 | 28 | 0 | 2 | 2 | 2.08 | .225 | 0.87 | 5.3 | 2.5 | 6.0 | 39.0 | 23 | 9 | 9 | 2 | 11 | 26 | 0 | 3 | 2 | 0 | 0 | 0 | 1 | 3.18 |
| RP | Embree, A.Embree, Alan >> | 34 | 2004 | L | 62 | 19 | 0 | 3 | 3 | 1.57 | .266 | 1.09 | 8.2 | 1.6 | 6.7 | 23.0 | 21 | 5 | 4 | 0 | 4 | 17 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 2.04 |
| RP | Timlin, M.Timlin, Mike >> | 38 | 2004 | R | 54 | 11 | 0 | 1 | 2 | 6.30 | .483 | 2.80 | 20.7 | 4.5 | 11.7 | 10.0 | 23 | 9 | 7 | 3 | 5 | 13 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 5.80 |
| RP | Leskanic, C.Leskanic, Curt >> | 36 | 2004 | R | 14 | 9 | 0 | 0 | 0 | 5.73 | .365 | 1.73 | 12.3 | 3.3 | 4.9 | 11.0 | 15 | 7 | 7 | 3 | 4 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6.55 |