| SP | Martinez, P.Martinez, Pedro >> | 32 | 2003 | R | 99 | 14 | 14 | 6 | 5 | 6.33 | .306 | 1.29 | 9.1 | 2.6 | 9.7 | 69.2 | 70 | 49 | 49 | 13 | 20 | 74 | 0 | 0 | 0 | 0 | 5 | 2 | 2 | 4.26 |
| SP | Redman, M.Redman, Mark # >> | 29 | 2003 | L | 80 | 14 | 14 | 4 | 7 | 4.74 | .288 | 1.21 | 8.2 | 2.8 | 7.0 | 81.2 | 74 | 44 | 43 | 21 | 25 | 63 | 0 | 0 | 0 | 0 | 7 | 0 | 1 | 5.74 |
| SP | Morris, M.Morris, Matt >> | 29 | 2003 | R | 77 | 14 | 14 | 6 | 4 | 3.84 | .295 | 1.22 | 8.7 | 2.4 | 5.9 | 84.1 | 81 | 37 | 36 | 8 | 22 | 55 | 0 | 0 | 0 | 0 | 7 | 3 | 2 | 3.82 |
| SP | Mulder, M.Mulder, Mark >> | 26 | 2003 | L | 75 | 14 | 14 | 3 | 4 | 4.79 | .309 | 1.31 | 9.1 | 2.7 | 6.7 | 82.2 | 83 | 49 | 44 | 16 | 25 | 61 | 3 | 0 | 0 | 2 | 6 | 3 | 4 | 5.07 |
| SP | Maddux, G.Maddux, Greg >> | 37 | 2003 | R | 60 | 12 | 12 | 3 | 3 | 4.57 | .351 | 1.62 | 11.5 | 3.1 | 7.8 | 61.0 | 78 | 33 | 31 | 9 | 21 | 53 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 4.21 |
| CL | Dotel, O.Dotel, Octavio >> | 30 | 2003 | R | 98 | 26 | 0 | 1 | 3 | 3.18 | .280 | 1.13 | 7.1 | 3.2 | 9.3 | 28.1 | 22 | 10 | 10 | 3 | 10 | 29 | 0 | 14 | 4 | 0 | 0 | 1 | 1 | 3.50 |
| RP | Timlin, M.Timlin, Mike >> | 37 | 2003 | R | 69 | 36 | 0 | 2 | 0 | 2.83 | .244 | 0.92 | 7.2 | 1.1 | 6.8 | 41.1 | 33 | 13 | 13 | 3 | 5 | 31 | 0 | 1 | 1 | 0 | 0 | 2 | 0 | 2.95 |
| RP | Lopez, A.Lopez, Aquilino >> | 28 | 2003 | R | 59 | 19 | 0 | 4 | 0 | 0.79 | .236 | 0.84 | 5.3 | 2.5 | 7.4 | 22.2 | 13 | 3 | 2 | 1 | 6 | 18 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 3.05 |
| RP | Shields, S.Shields, Scot >> | 28 | 2003 | R | 51 | 16 | 0 | 2 | 2 | 2.36 | .298 | 1.28 | 7.6 | 4.2 | 4.5 | 26.2 | 22 | 8 | 7 | 4 | 12 | 13 | 0 | 3 | 0 | 0 | 0 | 0 | 1 | 5.38 |
| RP | Cordero, F.Cordero, Francisco >> | 28 | 2003 | R | 46 | 16 | 0 | 1 | 1 | 3.26 | .318 | 1.34 | 6.2 | 6.2 | 8.5 | 19.1 | 13 | 7 | 7 | 3 | 13 | 18 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 5.37 |
| SP | Beckett, J.Beckett, Josh >> | 23 | 2003 | R | 49 | 7 | 0 | 1 | 2 | 3.38 | .250 | 1.00 | 6.4 | 2.6 | 8.3 | 24.0 | 17 | 9 | 9 | 1 | 7 | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.58 |