| SP | Carpenter, C.Carpenter, Chris >> | 29 | 2004 | R | 90 | 27 | 27 | 7 | 12 | 4.72 | .317 | 1.34 | 9.5 | 2.6 | 6.5 | 166.0 | 175 | 89 | 87 | 25 | 48 | 120 | 1 | 0 | 0 | 0 | 13 | 8 | 3 | 4.52 |
| SP | Arroyo, B.Arroyo, Bronson >> | 27 | 2004 | R | 79 | 26 | 26 | 5 | 11 | 5.32 | .332 | 1.47 | 10.5 | 2.7 | 6.8 | 128.2 | 150 | 78 | 76 | 19 | 39 | 97 | 0 | 0 | 0 | 0 | 5 | 3 | 3 | 4.40 |
| SP | Eaton, A.Eaton, Adam # >> | 27 | 2004 | R | 57 | 26 | 26 | 2 | 15 | 5.89 | .339 | 1.52 | 10.8 | 3.0 | 7.4 | 148.1 | 177 | 99 | 97 | 25 | 49 | 122 | 0 | 0 | 0 | 0 | 12 | 2 | 3 | 4.58 |
| SP | Leiter, A.Leiter, Al † >> | 39 | 2004 | L | 55 | 26 | 26 | 9 | 8 | 3.60 | .323 | 1.38 | 7.2 | 5.3 | 6.5 | 137.1 | 109 | 59 | 55 | 12 | 81 | 99 | 0 | 0 | 0 | 0 | 8 | 7 | 2 | 4.62 |
| SP | Suppan, J.Suppan, Jeff >> | 29 | 2004 | R | 32 | 26 | 26 | 7 | 13 | 5.80 | .346 | 1.57 | 10.6 | 3.6 | 5.7 | 149.0 | 175 | 105 | 96 | 31 | 59 | 94 | 0 | 0 | 0 | 0 | 9 | 2 | 1 | 5.67 |
| RP | Guardado, E.Guardado, Eddie # >> | 34 | 2004 | L | 91 | 70 | 0 | 5 | 4 | 5.03 | .326 | 1.38 | 8.5 | 3.9 | 10.6 | 93.0 | 88 | 54 | 52 | 12 | 40 | 110 | 0 | 3 | 2 | 0 | 0 | 7 | 0 | 3.83 |
| RP | Almanzar, C.Almanzar, Carlos >> | 31 | 2004 | R | 56 | 73 | 0 | 2 | 4 | 4.46 | .330 | 1.45 | 10.0 | 3.0 | 6.9 | 103.0 | 115 | 52 | 51 | 13 | 34 | 79 | 0 | 6 | 5 | 0 | 0 | 3 | 3 | 4.18 |
| RP | Shields, S.Shields, Scot >> | 29 | 2004 | R | 42 | 65 | 0 | 4 | 4 | 4.76 | .300 | 1.27 | 9.3 | 2.2 | 9.7 | 79.1 | 82 | 43 | 42 | 12 | 19 | 85 | 0 | 4 | 1 | 0 | 0 | 1 | 2 | 3.58 |
| RP | Witasick, J.Witasick, Jay >> | 32 | 2004 | R | 29 | 57 | 0 | 2 | 2 | 2.44 | .311 | 1.33 | 8.1 | 3.9 | 6.9 | 70.0 | 63 | 26 | 19 | 6 | 30 | 54 | 0 | 4 | 4 | 0 | 0 | 2 | 4 | 3.94 |
| RP | Alfonseca, A.Alfonseca, Antonio >> | 32 | 2004 | R | 18 | 56 | 0 | 5 | 1 | 4.40 | .326 | 1.45 | 9.2 | 4.0 | 6.3 | 59.1 | 60 | 30 | 29 | 5 | 26 | 41 | 0 | 6 | 0 | 0 | 0 | 0 | 3 | 4.03 |