| SP | Perez, O.Perez, Oliver † >> | 23 | 2004 | L | 96 | 19 | 19 | 8 | 6 | 3.31 | .282 | 1.12 | 6.3 | 3.8 | 9.4 | 122.1 | 86 | 45 | 45 | 11 | 51 | 127 | 0 | 0 | 0 | 0 | 12 | 7 | 3 | 3.52 |
| SP | Greinke, Z.Greinke, Zack # >> | 21 | 2004 | R | 76 | 18 | 18 | 9 | 6 | 4.36 | .289 | 1.19 | 8.3 | 2.5 | 6.5 | 109.1 | 100 | 58 | 53 | 21 | 30 | 79 | 1 | 0 | 0 | 0 | 10 | 3 | 4 | 4.96 |
| SP | Williams, J.Williams, Jerome >> | 23 | 2004 | R | 58 | 18 | 18 | 9 | 6 | 4.24 | .322 | 1.39 | 9.3 | 3.3 | 5.8 | 97.2 | 100 | 50 | 46 | 15 | 36 | 62 | 0 | 0 | 0 | 0 | 7 | 3 | 2 | 4.94 |
| RP | Wagner, B.Wagner, Billy >> | 33 | 2004 | L | 100 | 50 | 0 | 5 | 4 | 3.60 | .241 | 0.91 | 7.5 | 0.7 | 10.0 | 80.0 | 67 | 33 | 32 | 12 | 6 | 89 | 0 | 2 | 3 | 0 | 0 | 3 | 0 | 3.06 |
| RP | Otsuka, A.Otsuka, Akinori >> | 32 | 2004 | R | 88 | 40 | 0 | 3 | 0 | 4.19 | .309 | 1.32 | 9.3 | 2.7 | 9.8 | 53.2 | 55 | 25 | 25 | 5 | 16 | 58 | 0 | 6 | 2 | 0 | 0 | 1 | 0 | 3.00 |
| RP | Mercker, K.Mercker, Kent >> | 36 | 2004 | L | 69 | 30 | 0 | 1 | 0 | 4.67 | .329 | 1.41 | 7.1 | 5.8 | 6.9 | 34.2 | 27 | 18 | 18 | 4 | 22 | 26 | 0 | 5 | 0 | 0 | 0 | 2 | 0 | 5.12 |
| RP | Tavarez, J.Tavarez, Julian >> | 31 | 2004 | R | 59 | 27 | 0 | 4 | 0 | 3.64 | .315 | 1.35 | 9.9 | 2.5 | 6.2 | 29.2 | 32 | 12 | 12 | 5 | 8 | 20 | 0 | 3 | 1 | 0 | 0 | 1 | 1 | 4.79 |
| RP | Timlin, M.Timlin, Mike >> | 38 | 2004 | R | 40 | 24 | 0 | 0 | 0 | 2.18 | .202 | 0.76 | 4.9 | 1.9 | 6.8 | 33.0 | 18 | 8 | 8 | 4 | 7 | 25 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 3.70 |