| SP | Prior, M.Prior, Mark † # >> | 23 | 2003 | R | 94 | 33 | 33 | 14 | 9 | 3.81 | .297 | 1.26 | 9.0 | 2.4 | 9.0 | 224.1 | 223 | 96 | 95 | 24 | 60 | 225 | 3 | 0 | 0 | 0 | 21 | 2 | 6 | 3.21 |
| SP | Zito, B.Zito, Barry $$ >> | 25 | 2003 | L | 86 | 32 | 32 | 12 | 10 | 4.33 | .303 | 1.28 | 8.0 | 3.5 | 5.9 | 203.2 | 181 | 101 | 98 | 20 | 79 | 133 | 3 | 0 | 0 | 3 | 19 | 6 | 4 | 4.23 |
| SP | Willis, D.Willis, Dontrelle >> | 21 | 2003 | L | 62 | 32 | 32 | 10 | 7 | 5.66 | .350 | 1.57 | 9.8 | 4.3 | 6.0 | 151.0 | 165 | 97 | 95 | 20 | 72 | 100 | 0 | 0 | 0 | 0 | 7 | 7 | 9 | 4.97 |
| SP | Hentgen, P.Hentgen, Pat >> | 35 | 2003 | R | 48 | 29 | 29 | 7 | 6 | 5.52 | .353 | 1.61 | 10.1 | 4.4 | 6.0 | 140.1 | 157 | 91 | 86 | 20 | 69 | 94 | 0 | 0 | 0 | 0 | 3 | 4 | 6 | 5.08 |
| CL | Nathan, J.Nathan, Joe † $ >> | 29 | 2003 | R | 89 | 68 | 0 | 6 | 3 | 1.54 | .283 | 1.13 | 6.4 | 3.7 | 9.4 | 70.0 | 50 | 13 | 12 | 1 | 29 | 73 | 0 | 40 | 1 | 0 | 0 | 4 | 5 | 2.51 |
| SU | Smoltz, J.Smoltz, John >> | 36 | 2003 | R | 93 | 80 | 0 | 11 | 1 | 3.02 | .256 | 1.02 | 8.0 | 1.3 | 9.5 | 86.1 | 76 | 32 | 29 | 9 | 12 | 91 | 0 | 1 | 2 | 0 | 0 | 1 | 2 | 2.70 |
| RP | Rivera, M.Rivera, Mariano $ >> | 34 | 2003 | R | 75 | 77 | 0 | 5 | 1 | 3.92 | .301 | 1.27 | 8.2 | 3.3 | 7.0 | 80.1 | 73 | 35 | 35 | 9 | 29 | 62 | 0 | 8 | 7 | 0 | 0 | 2 | 0 | 4.08 |
| RP | de los Santos, V.de los Santos, Valerio >> | 31 | 2003 | L | 36 | 45 | 0 | 4 | 0 | 2.86 | .288 | 1.15 | 6.1 | 4.3 | 3.8 | 50.1 | 34 | 16 | 16 | 3 | 24 | 21 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 4.56 |
| RP | Schoeneweis, S.Schoeneweis, Scott >> | 30 | 2003 | L | 40 | 69 | 0 | 8 | 3 | 3.09 | .294 | 1.23 | 9.6 | 1.5 | 5.2 | 64.0 | 68 | 24 | 22 | 8 | 11 | 37 | 0 | 1 | 1 | 0 | 0 | 1 | 2 | 4.03 |
| RP | Hawkins, L.Hawkins, LaTroy # >> | 31 | 2003 | R | 70 | 78 | 0 | 2 | 5 | 4.26 | .305 | 1.30 | 9.2 | 2.5 | 6.3 | 57.0 | 58 | 31 | 27 | 7 | 16 | 40 | 0 | 2 | 3 | 0 | 0 | 1 | 0 | 4.09 |
| RP | Remlinger, M.Remlinger, Mike >> | 37 | 2003 | L | 49 | 76 | 0 | 6 | 1 | 4.93 | .356 | 1.62 | 9.6 | 5.1 | 7.5 | 76.2 | 81 | 46 | 42 | 8 | 43 | 63 | 0 | 4 | 4 | 0 | 0 | 3 | 2 | 4.53 |