| SP | Martinez, P.Martinez, Pedro # $$ >> | 32 | 2003 | R | 99 | 10 | 10 | 4 | 4 | 5.14 | .326 | 1.43 | 9.6 | 3.4 | 8.1 | 61.1 | 65 | 35 | 35 | 10 | 23 | 55 | 0 | 0 | 0 | 0 | 4 | 1 | 1 | 4.51 |
| SP | Clemens, R.Clemens, Roger >> | 41 | 2003 | R | 78 | 9 | 9 | 3 | 3 | 4.13 | .332 | 1.38 | 9.5 | 2.9 | 7.1 | 52.1 | 55 | 26 | 24 | 3 | 17 | 41 | 0 | 0 | 0 | 0 | 5 | 6 | 0 | 3.50 |
| SP | Mulder, M.Mulder, Mark >> | 26 | 2003 | L | 75 | 10 | 9 | 4 | 3 | 6.32 | .368 | 1.74 | 11.5 | 4.2 | 6.9 | 47.0 | 60 | 33 | 33 | 6 | 22 | 36 | 0 | 0 | 0 | 0 | 3 | 0 | 1 | 4.53 |
| SP | Williams, W.Williams, Woody >> | 37 | 2003 | R | 57 | 9 | 9 | 3 | 3 | 5.83 | .344 | 1.50 | 10.7 | 2.8 | 6.8 | 54.0 | 64 | 36 | 35 | 6 | 17 | 41 | 0 | 0 | 0 | 0 | 3 | 4 | 0 | 4.09 |
| SP | Pavano, C.Pavano, Carl >> | 27 | 2003 | R | 46 | 9 | 9 | 2 | 2 | 7.15 | .382 | 1.81 | 13.6 | 2.8 | 7.6 | 45.1 | 68 | 41 | 36 | 7 | 14 | 38 | 0 | 0 | 0 | 0 | 3 | 2 | 0 | 4.40 |
| CL | Soriano, R.Soriano, Rafael >> | 24 | 2003 | R | 100 | 18 | 0 | 0 | 3 | 3.86 | .267 | 1.10 | 6.9 | 3.0 | 8.6 | 21.0 | 16 | 9 | 9 | 2 | 7 | 20 | 0 | 11 | 1 | 0 | 0 | 0 | 0 | 3.33 |
| SU | Herges, M.Herges, Matt >> | 33 | 2003 | R | 60 | 17 | 0 | 2 | 0 | 2.93 | .207 | 0.78 | 6.0 | 1.2 | 9.6 | 15.1 | 10 | 5 | 5 | 1 | 2 | 16 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 2.13 |
| RP | Guardado, E.Guardado, Eddie >> | 33 | 2003 | L | 87 | 24 | 0 | 1 | 0 | 4.15 | .291 | 1.23 | 9.3 | 1.7 | 7.3 | 26.0 | 27 | 12 | 12 | 4 | 5 | 21 | 0 | 0 | 1 | 0 | 0 | 0 | 3 | 3.96 |
| RP | Fuentes, B.Fuentes, Brian >> | 28 | 2003 | L | 50 | 20 | 0 | 0 | 0 | 1.98 | .317 | 1.39 | 9.0 | 4.2 | 9.0 | 13.2 | 13 | 3 | 3 | 2 | 6 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4.38 |
| RP | Donnelly, B.Donnelly, Brendan >> | 32 | 2003 | R | 83 | 25 | 0 | 1 | 1 | 4.24 | .333 | 1.50 | 7.8 | 5.9 | 11.7 | 23.1 | 20 | 11 | 11 | 2 | 15 | 30 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 3.48 |
| RP | Hawkins, L.Hawkins, LaTroy >> | 31 | 2003 | R | 70 | 25 | 0 | 2 | 4 | 4.56 | .324 | 1.44 | 10.2 | 3.1 | 6.3 | 23.2 | 26 | 13 | 12 | 2 | 8 | 16 | 0 | 2 | 2 | 0 | 0 | 0 | 1 | 3.78 |
| RP | Cordero, F.Cordero, Francisco >> | 28 | 2003 | R | 46 | 2 | 0 | 0 | 0 | 9.00 | .455 | 2.50 | 22.5 | 0.0 | 13.5 | 2.0 | 5 | 2 | 2 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.00 |