| SP | Martinez, P.Martinez, Pedro $ >> | 32 | 2003 | R | 99 | 23 | 23 | 7 | 9 | 3.88 | .326 | 1.42 | 9.3 | 3.5 | 9.5 | 148.1 | 153 | 72 | 64 | 14 | 57 | 157 | 1 | 0 | 0 | 0 | 13 | 5 | 3 | 3.36 |
| SP | Colon, B.Colon, Bartolo >> | 30 | 2003 | R | 79 | 22 | 22 | 7 | 11 | 4.68 | .316 | 1.34 | 8.7 | 3.4 | 6.3 | 144.1 | 139 | 77 | 75 | 19 | 55 | 100 | 3 | 0 | 0 | 1 | 10 | 6 | 2 | 4.60 |
| SP | Mulder, M.Mulder, Mark >> | 26 | 2003 | L | 75 | 22 | 22 | 10 | 7 | 4.16 | .312 | 1.32 | 8.9 | 3.0 | 6.4 | 155.2 | 154 | 75 | 72 | 16 | 52 | 110 | 2 | 0 | 0 | 1 | 12 | 6 | 4 | 4.05 |
| SP | Willis, D.Willis, Dontrelle >> | 21 | 2003 | L | 62 | 22 | 22 | 5 | 4 | 6.01 | .353 | 1.58 | 10.5 | 3.8 | 6.4 | 109.1 | 127 | 73 | 73 | 14 | 46 | 78 | 0 | 0 | 0 | 0 | 4 | 6 | 4 | 4.67 |
| SP | Wells, D.Wells, David # >> | 40 | 2003 | L | 40 | 21 | 21 | 10 | 6 | 4.65 | .326 | 1.41 | 10.5 | 2.2 | 5.5 | 124.0 | 145 | 64 | 64 | 21 | 30 | 76 | 0 | 0 | 0 | 0 | 12 | 5 | 0 | 4.82 |
| CL | Dotel, O.Dotel, Octavio † >> | 30 | 2003 | R | 98 | 46 | 0 | 6 | 4 | 3.13 | .296 | 1.26 | 7.4 | 3.9 | 10.0 | 46.0 | 38 | 16 | 16 | 5 | 20 | 51 | 0 | 29 | 4 | 0 | 0 | 0 | 0 | 3.50 |
| RP | Mota, G.Mota, Guillermo >> | 30 | 2003 | R | 88 | 61 | 0 | 2 | 2 | 2.19 | .286 | 1.14 | 8.0 | 2.4 | 5.8 | 61.2 | 54 | 16 | 15 | 3 | 16 | 39 | 0 | 0 | 1 | 0 | 0 | 4 | 0 | 3.34 |
| SU | Donnelly, B.Donnelly, Brendan >> | 32 | 2003 | R | 83 | 44 | 0 | 4 | 1 | 3.42 | .315 | 1.34 | 8.6 | 3.4 | 8.3 | 50.0 | 48 | 20 | 19 | 5 | 19 | 46 | 0 | 4 | 5 | 0 | 0 | 2 | 0 | 3.72 |
| RP | Fuentes, B.Fuentes, Brian >> | 28 | 2003 | L | 50 | 56 | 0 | 2 | 0 | 3.54 | .333 | 1.45 | 7.4 | 5.9 | 10.8 | 40.2 | 33 | 17 | 16 | 2 | 26 | 48 | 0 | 3 | 2 | 0 | 0 | 2 | 1 | 3.35 |
| RP | Herges, M.Herges, Matt $ >> | 33 | 2003 | R | 60 | 37 | 0 | 3 | 0 | 3.67 | .331 | 1.41 | 8.3 | 4.3 | 4.7 | 27.0 | 25 | 12 | 11 | 4 | 13 | 14 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 5.56 |
| RP | Hawkins, L.Hawkins, LaTroy >> | 31 | 2003 | R | 70 | 43 | 0 | 1 | 0 | 4.95 | .343 | 1.54 | 11.0 | 3.0 | 7.8 | 36.1 | 44 | 20 | 20 | 5 | 12 | 31 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 4.17 |
| RP | Farnsworth, K.Farnsworth, Kyle >> | 27 | 2003 | R | 82 | 22 | 0 | 4 | 3 | 8.06 | .362 | 1.70 | 9.8 | 5.7 | 9.4 | 22.1 | 24 | 20 | 20 | 6 | 14 | 23 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 6.36 |
| RP | Miller, T.Miller, Trever >> | 30 | 2003 | L | 26 | 51 | 0 | 2 | 0 | 5.54 | .405 | 2.04 | 12.5 | 5.9 | 6.6 | 26.0 | 36 | 16 | 16 | 0 | 17 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3.50 |