| SP | Halladay, R.Halladay, Roy † >> | 26 | 2003 | R | 85 | 22 | 22 | 14 | 4 | 4.07 | .280 | 1.14 | 8.5 | 1.8 | 6.1 | 165.2 | 156 | 78 | 75 | 22 | 33 | 112 | 5 | 0 | 0 | 2 | 10 | 4 | 4 | 4.05 |
| SP | Hentgen, P.Hentgen, Pat >> | 35 | 2003 | R | 48 | 22 | 22 | 0 | 5 | 6.47 | .356 | 1.61 | 10.2 | 4.4 | 5.5 | 80.2 | 91 | 62 | 58 | 14 | 39 | 49 | 0 | 0 | 0 | 0 | 0 | 4 | 4 | 5.66 |
| SP | Zambrano, C.Zambrano, Carlos # >> | 22 | 2003 | R | 55 | 22 | 22 | 9 | 8 | 4.55 | .317 | 1.37 | 8.7 | 3.7 | 6.1 | 126.2 | 122 | 65 | 64 | 15 | 52 | 86 | 0 | 0 | 0 | 0 | 12 | 2 | 3 | 4.47 |
| RP | Soriano, R.Soriano, Rafael >> | 24 | 2003 | R | 100 | 58 | 0 | 8 | 2 | 3.19 | .287 | 1.18 | 7.3 | 3.4 | 9.8 | 90.1 | 73 | 32 | 32 | 4 | 34 | 98 | 0 | 8 | 5 | 0 | 0 | 2 | 0 | 2.60 |
| RP | Urbina, U.Urbina, Ugueth >> | 29 | 2003 | R | 80 | 52 | 0 | 9 | 5 | 3.18 | .281 | 1.15 | 7.2 | 3.2 | 6.9 | 70.2 | 56 | 25 | 25 | 9 | 25 | 54 | 0 | 3 | 4 | 0 | 0 | 2 | 1 | 4.29 |
| RP | Embree, A.Embree, Alan >> | 33 | 2003 | L | 61 | 38 | 0 | 5 | 1 | 3.80 | .304 | 1.29 | 9.6 | 2.1 | 7.1 | 42.2 | 45 | 18 | 18 | 1 | 10 | 33 | 0 | 5 | 0 | 0 | 0 | 1 | 0 | 2.52 |
| RP | Shields, S.Shields, Scot >> | 28 | 2003 | R | 51 | 33 | 0 | 4 | 3 | 4.56 | .304 | 1.28 | 8.8 | 2.7 | 5.4 | 53.1 | 52 | 30 | 27 | 7 | 16 | 32 | 0 | 3 | 0 | 0 | 0 | 2 | 3 | 4.53 |
| SP | Franklin, R.Franklin, Ryan >> | 30 | 2003 | R | 67 | 6 | 0 | 1 | 0 | 8.10 | .385 | 1.80 | 12.5 | 4.2 | 4.2 | 13.1 | 18 | 12 | 12 | 4 | 6 | 6 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 7.69 |