| SP | Martinez, P.Martinez, Pedro >> | 33 | 2004 | R | 92 | 7 | 7 | 1 | 3 | 2.68 | .266 | 1.04 | 6.5 | 2.9 | 9.6 | 47.0 | 34 | 17 | 14 | 2 | 15 | 50 | 0 | 0 | 0 | 0 | 5 | 2 | 0 | 2.51 |
| SP | Greinke, Z.Greinke, Zack >> | 21 | 2004 | R | 76 | 6 | 6 | 2 | 4 | 5.11 | .311 | 1.32 | 10.0 | 1.9 | 6.6 | 37.0 | 41 | 22 | 21 | 10 | 8 | 27 | 0 | 0 | 0 | 0 | 3 | 1 | 0 | 5.78 |
| SP | Leiter, A.Leiter, Al # >> | 39 | 2004 | L | 55 | 7 | 7 | 3 | 2 | 5.91 | .352 | 1.60 | 8.0 | 6.4 | 6.2 | 35.0 | 31 | 23 | 23 | 4 | 25 | 24 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 5.34 |
| SP | Halladay, R.Halladay, Roy >> | 27 | 2004 | R | 36 | 6 | 6 | 2 | 3 | 5.45 | .369 | 1.67 | 8.7 | 6.3 | 6.8 | 33.0 | 32 | 22 | 20 | 2 | 23 | 25 | 0 | 0 | 0 | 0 | 3 | 3 | 0 | 4.64 |
| RP | Rincon, J.Rincon, Juan >> | 25 | 2004 | R | 94 | 17 | 0 | 0 | 1 | 4.03 | .309 | 1.30 | 7.0 | 4.9 | 8.6 | 22.1 | 17 | 10 | 10 | 3 | 12 | 21 | 0 | 0 | 2 | 0 | 0 | 1 | 0 | 4.64 |
| RP | Cormier, R.Cormier, Rheal >> | 37 | 2004 | L | 61 | 17 | 0 | 0 | 3 | 2.81 | .313 | 1.29 | 8.6 | 3.2 | 4.3 | 25.2 | 24 | 9 | 8 | 0 | 9 | 12 | 0 | 4 | 0 | 0 | 0 | 2 | 1 | 3.36 |
| SP | Lackey, J.Lackey, John >> | 26 | 2004 | R | 20 | 1 | 0 | 0 | 0 | 0.00 | .500 | 3.00 | - | - | - | 0.1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | - |