| West | W | L | Pct | GB |
| Oakland | 96 | 66 | .593 | -- |
| Seattle | 93 | 69 | .574 | 3.0 |
| Anaheim | 77 | 85 | .475 | 19.0 |
| Texas | 71 | 91 | .438 | 25.0 |
| Date | Pitcher | Hand | Age | Game Result | Opp | GS# | Career | Dec | IP | H | R | ER | HR | BB | SO | Pit | Bal | Str | Str% | W-L | ERA | WHIP |
| 2003-03-30 | Ismael Valdez | R | 30 | W 6-3 | @ ANA | 1 | 229 | W | 5.0 | 7 | 3 | 3 | 0 | 1 | 1 | 66 | 20 | 46 | 70% | 1-0 | 5.40 | 1.60 |
| 2003-04-01 | Chan Ho Park | R | 30 | L 0-10 | @ ANA | 1 | 202 | L | 2.2 | 6 | 6 | 6 | 1 | 3 | 0 | 51 | 24 | 27 | 53% | 0-1 | 18.00 | 3.00 |
| 2003-04-02 | John Thomson | R | 30 | L 5-11 | @ ANA | 1 | 111 | L | 4.1 | 10 | 6 | 6 | 2 | 0 | 3 | 82 | 28 | 54 | 66% | 0-1 | 13.50 | 2.50 |
| 2003-04-04 | Ismael Valdez | R | 30 | W 4-6 | vs SEA | 2 | 230 | - | 6.0 | 4 | 3 | 2 | 1 | 0 | 4 | 84 | 34 | 50 | 60% | 1-0 | 4.09 | 1.09 |
| 2003-04-05 | Colby Lewis | R | 24 | L 8-4 | vs SEA | 1 | 5 | W | 6.2 | 8 | 3 | 3 | 1 | 2 | 8 | 112 | 45 | 67 | 60% | 1-0 | 3.86 | 1.43 |
| 2003-04-06 | Chan Ho Park | R | 30 | W 2-11 | vs SEA | 2 | 203 | L | 3.0 | 5 | 4 | 4 | 1 | 3 | 3 | 75 | 35 | 40 | 53% | 0-2 | 15.00 | 2.83 |
| 2003-04-08 | John Thomson | R | 30 | W 1-2 | vs OAK | 2 | 112 | - | 6.0 | 7 | 1 | 1 | 0 | 2 | 7 | 121 | 45 | 76 | 63% | 0-1 | 6.30 | 1.90 |
| 2003-04-09 | Ismael Valdez | R | 30 | W 5-13 | vs OAK | 3 | 231 | L | 4.0 | 7 | 8 | 8 | 3 | 2 | 6 | 87 | 37 | 50 | 57% | 1-1 | 7.80 | 1.40 |
| 2003-04-10 | Colby Lewis | R | 24 | L 5-4 | vs OAK | 2 | 6 | - | 3.2 | 4 | 4 | 4 | 1 | 8 | 1 | 103 | 53 | 50 | 49% | 1-0 | 6.30 | 2.20 |
| 2003-04-11 | Chan Ho Park | R | 30 | W 4-2 | @ SEA | 3 | 204 | W | 5.0 | 3 | 1 | 1 | 0 | 7 | 5 | 112 | 51 | 61 | 54% | 1-2 | 9.00 | 2.45 |
| 2003-04-12 | Ryan Drese | R | 27 | L 4-13 | @ SEA | 1 | 31 | L | 0.1 | 4 | 6 | 5 | 0 | 3 | 1 | 38 | 17 | 21 | 55% | 0-1 | -- | -- |
| 2003-04-13 | John Thomson | R | 30 | L 3-4 | @ SEA | 3 | 113 | - | 7.0 | 6 | 3 | 3 | 2 | 0 | 6 | 99 | 31 | 68 | 69% | 0-1 | 5.29 | 1.47 |
| 2003-04-14 | Ismael Valdez | R | 30 | L 4-0 | vs ANA | 4 | 232 | W | 8.0 | 5 | 0 | 0 | 0 | 2 | 7 | 118 | 44 | 74 | 63% | 2-1 | 5.09 | 1.22 |
| 2003-04-15 | Colby Lewis | R | 24 | L 5-4 | vs ANA | 3 | 7 | W | 6.0 | 7 | 3 | 3 | 1 | 4 | 2 | 106 | 46 | 60 | 57% | 2-0 | 5.63 | 2.06 |
| 2003-04-16 | Chan Ho Park | R | 30 | W 8-9 | vs ANA | 4 | 205 | - | 6.0 | 5 | 2 | 2 | 0 | 1 | 2 | 73 | 27 | 46 | 63% | 1-2 | 6.88 | 1.94 |
| 2003-04-17 | Ryan Drese | R | 27 | L 9-7 | vs ANA | 2 | 32 | W | 7.0 | 9 | 4 | 4 | 2 | 4 | 8 | 136 | 56 | 80 | 59% | 1-1 | 11.57 | 2.86 |
| 2003-04-18 | John Thomson | R | 30 | L 0-9 | @ OAK | 4 | 114 | L | 3.2 | 8 | 8 | 3 | 2 | 0 | 3 | 87 | 30 | 57 | 66% | 0-2 | 5.57 | 1.57 |
| 2003-04-19 | Ismael Valdez | R | 30 | L 2-12 | @ OAK | 5 | 233 | L | 3.2 | 7 | 6 | 4 | 1 | 2 | 1 | 88 | 33 | 55 | 63% | 2-2 | 5.67 | 1.37 |
| 2003-04-20 | Colby Lewis | R | 24 | W 2-1 | @ OAK | 4 | 8 | W | 6.0 | 4 | 1 | 1 | 0 | 4 | 3 | 92 | 39 | 53 | 58% | 3-0 | 4.50 | 1.86 |
| 2003-04-22 | Chan Ho Park | R | 30 | W 4-5 | vs BOS | 5 | 206 | L | 7.0 | 8 | 4 | 4 | 0 | 2 | 3 | 96 | 33 | 63 | 66% | 1-3 | 6.38 | 1.79 |
| 2003-04-23 | John Thomson | R | 30 | L 6-1 | vs BOS | 5 | 115 | W | 7.0 | 6 | 1 | 1 | 0 | 1 | 3 | 106 | 43 | 63 | 59% | 1-2 | 4.50 | 1.43 |
| 2003-04-24 | Ryan Drese | R | 27 | L 16-5 | vs BOS | 3 | 33 | - | 2.0 | 5 | 4 | 3 | 0 | 3 | 4 | 68 | 32 | 36 | 53% | 1-1 | 12.00 | 3.11 |
| 2003-04-25 | Colby Lewis | R | 24 | W 2-3 | vs NYA | 5 | 9 | L | 6.0 | 6 | 3 | 3 | 1 | 5 | 2 | 103 | 46 | 57 | 55% | 3-1 | 4.50 | 1.86 |
| 2003-04-26 | Doug Davis | L | 28 | W 5-7 | vs NYA | 1 | 54 | - | 3.0 | 4 | 4 | 4 | 2 | 4 | 2 | 73 | 31 | 42 | 58% | 0-0 | 12.00 | 2.67 |
| 2003-04-27 | Chan Ho Park | R | 30 | L 10-7 | vs NYA | 6 | 207 | - | 4.0 | 4 | 5 | 5 | 1 | 5 | 2 | 92 | 48 | 44 | 48% | 1-3 | 7.07 | 1.86 |
| 2003-04-29 | John Thomson | R | 30 | W 16-11 | @ TOR | 6 | 116 | W | 5.0 | 7 | 4 | 4 | 1 | 2 | 1 | 86 | 35 | 51 | 59% | 2-2 | 4.91 | 1.48 |
| 2003-04-30 | Ryan Drese | R | 27 | W 11-3 | @ TOR | 4 | 34 | W | 6.0 | 7 | 2 | 1 | 0 | 5 | 4 | 95 | 44 | 51 | 54% | 2-1 | 7.80 | 2.67 |
| 2003-05-01 | Colby Lewis | R | 24 | L 6-7 | @ TOR | 6 | 10 | L | 2.0 | 7 | 7 | 7 | 1 | 1 | 3 | 49 | 19 | 30 | 61% | 3-2 | 6.30 | 2.00 |
| 2003-05-02 | Joaquin Benoit | R | 26 | L 5-6 | @ CLE | 1 | 15 | - | 5.1 | 3 | 4 | 4 | 2 | 1 | 6 | 82 | 31 | 51 | 62% | 0-0 | 7.20 | 0.80 |
| 2003-05-03 | Todd Van Poppel | R | 31 | W 6-5 | @ CLE | 1 | 84 | - | 4.0 | 5 | 5 | 3 | 1 | 2 | 2 | 76 | 31 | 45 | 59% | 0-0 | 6.75 | 1.75 |
| 2003-05-04 | John Thomson | R | 30 | L 1-3 | @ CLE | 7 | 117 | L | 8.0 | 5 | 3 | 3 | 0 | 2 | 4 | 107 | 36 | 71 | 66% | 2-3 | 4.61 | 1.37 |
| 2003-05-06 | Colby Lewis | R | 24 | W 5-15 | vs TOR | 7 | 11 | L | 2.0 | 5 | 6 | 6 | 3 | 1 | 2 | 46 | 19 | 27 | 59% | 3-3 | 7.59 | 2.06 |
| 2003-05-07 | Joaquin Benoit | R | 26 | L 5-4 | vs TOR | 2 | 16 | - | 5.0 | 5 | 3 | 3 | 1 | 1 | 6 | 84 | 34 | 50 | 60% | 0-0 | 6.30 | 1.00 |
| 2003-05-08 | Ryan Drese | R | 27 | W 6-8 | vs TOR | 5 | 35 | L | 4.2 | 5 | 5 | 4 | 2 | 2 | 4 | 82 | 33 | 49 | 60% | 2-2 | 7.65 | 2.35 |
| 2003-05-09 | John Thomson | R | 30 | W 5-9 | vs CLE | 8 | 118 | L | 2.1 | 8 | 7 | 7 | 0 | 0 | 1 | 50 | 19 | 31 | 62% | 2-4 | 5.86 | 1.49 |
| 2003-05-10 | Alan Benes | R | 31 | W 4-6 | vs CLE | 1 | 67 | L | 3.1 | 6 | 5 | 4 | 0 | 2 | 3 | 68 | 28 | 40 | 59% | 0-1 | 4.50 | 1.83 |
| 2003-05-11 | Colby Lewis | R | 24 | L 17-10 | vs CLE | 8 | 12 | - | 3.2 | 5 | 5 | 5 | 0 | 4 | 3 | 82 | 36 | 46 | 56% | 3-3 | 8.00 | 2.08 |
| 2003-05-13 | John Thomson | R | 30 | L 4-5 | @ BOS | 9 | 119 | - | 6.0 | 3 | 2 | 2 | 2 | 0 | 1 | 77 | 25 | 52 | 68% | 2-4 | 5.51 | 1.37 |
| 2003-05-14 | Joaquin Benoit | R | 26 | L 1-7 | @ BOS | 3 | 17 | L | 4.1 | 3 | 3 | 3 | 1 | 5 | 2 | 95 | 44 | 51 | 54% | 1-1 | 5.29 | 1.06 |
| 2003-05-15 | Alan Benes | R | 31 | L 3-12 | @ BOS | 2 | 68 | L | 3.0 | 7 | 6 | 6 | 0 | 2 | 1 | 82 | 33 | 49 | 60% | 0-2 | 7.20 | 2.07 |
| 2003-05-16 | Colby Lewis | R | 24 | W 8-5 | @ NYA | 9 | 13 | - | 5.0 | 7 | 4 | 3 | 0 | 3 | 6 | 87 | 37 | 50 | 57% | 3-3 | 7.68 | 2.07 |
| 2003-05-17 | Ismael Valdez | R | 30 | W 5-2 | @ NYA | 6 | 234 | W | 5.0 | 5 | 2 | 2 | 1 | 1 | 1 | 75 | 27 | 48 | 64% | 3-2 | 5.34 | 1.34 |
| 2003-05-18 | John Thomson | R | 30 | W 5-1 | @ NYA | 10 | 120 | W | 9.0 | 3 | 1 | 1 | 0 | 5 | 9 | 132 | 64 | 68 | 52% | 3-4 | 4.81 | 1.29 |
| 2003-05-20 | Joaquin Benoit | R | 26 | L 5-2 | vs TBA | 4 | 18 | W | 7.0 | 4 | 2 | 2 | 1 | 2 | 8 | 110 | 40 | 70 | 64% | 2-1 | 4.50 | 1.00 |
| 2003-05-21 | Alan Benes | R | 31 | L 8-7 | vs TBA | 3 | 69 | - | 5.1 | 10 | 5 | 5 | 0 | 0 | 2 | 75 | 23 | 52 | 69% | 0-2 | 7.65 | 2.05 |
| 2003-05-22 | Colby Lewis | R | 24 | L 10-8 | vs TBA | 10 | 14 | - | 4.0 | 7 | 7 | 7 | 1 | 4 | 2 | 87 | 40 | 47 | 54% | 3-3 | 8.40 | 2.13 |
| 2003-05-23 | Ismael Valdez | R | 30 | L 5-3 | vs BAL | 7 | 235 | W | 6.0 | 10 | 3 | 3 | 0 | 0 | 1 | 86 | 32 | 54 | 63% | 4-2 | 5.21 | 1.39 |
| 2003-05-24 | John Thomson | R | 30 | W 3-10 | vs BAL | 11 | 121 | L | 6.2 | 8 | 4 | 4 | 2 | 2 | 5 | 102 | 37 | 65 | 64% | 3-5 | 4.85 | 1.31 |
| 2003-05-25 | Joaquin Benoit | R | 26 | W 10-13 | vs BAL | 5 | 19 | - | 3.0 | 5 | 6 | 6 | 1 | 3 | 2 | 84 | 30 | 54 | 64% | 2-1 | 6.00 | 1.19 |
| 2003-05-27 | Colby Lewis | R | 24 | W 4-2 | @ TBA | 11 | 15 | W | 5.0 | 4 | 1 | 1 | 0 | 2 | 5 | 73 | 28 | 45 | 62% | 4-3 | 7.74 | 2.04 |
| 2003-05-28 | Alan Benes | R | 31 | L 4-6 | @ TBA | 4 | 70 | L | 3.1 | 6 | 4 | 4 | 2 | 4 | 5 | 77 | 32 | 45 | 58% | 0-3 | 8.22 | 2.22 |
| 2003-05-29 | Ismael Valdez | R | 30 | W 8-4 | @ BAL | 8 | 236 | W | 5.2 | 4 | 2 | 2 | 0 | 1 | 0 | 88 | 36 | 52 | 59% | 5-2 | 5.02 | 1.35 |
| 2003-05-30 | John Thomson | R | 30 | L 1-8 | @ BAL | 12 | 122 | L | 6.1 | 8 | 6 | 6 | 1 | 1 | 4 | 107 | 37 | 70 | 65% | 3-6 | 5.20 | 1.32 |
| 2003-05-31 | Joaquin Benoit | R | 26 | L 1-7 | @ BAL | 6 | 20 | L | 5.2 | 6 | 4 | 2 | 1 | 4 | 3 | 109 | 49 | 60 | 55% | 2-2 | 5.63 | 1.31 |
| 2003-06-01 | Colby Lewis | R | 24 | L 4-5 | @ BAL | 12 | 16 | - | 6.0 | 8 | 3 | 3 | 1 | 5 | 3 | 107 | 44 | 63 | 59% | 4-3 | 7.39 | 2.05 |
| 2003-06-03 | Ismael Valdez | R | 30 | L 5-6 | @ ATL | 9 | 237 | - | 7.0 | 9 | 4 | 4 | 0 | 2 | 5 | 108 | 41 | 67 | 62% | 5-2 | 5.04 | 1.38 |
| 2003-06-04 | John Thomson | R | 30 | L 2-5 | @ ATL | 13 | 123 | L | 5.0 | 6 | 4 | 3 | 1 | 1 | 1 | 87 | 32 | 55 | 63% | 3-7 | 5.21 | 1.33 |
| 2003-06-05 | Victor Santos | R | 27 | L 4-8 | @ ATL | 1 | 10 | - | 5.0 | 6 | 4 | 4 | 1 | 2 | 5 | 89 | 36 | 53 | 60% | 0-0 | 7.20 | 1.60 |
| 2003-06-06 | Colby Lewis | R | 24 | L 10-13 | @ MON | 13 | 17 | L | 3.0 | 7 | 7 | 7 | 0 | 4 | 3 | 80 | 33 | 47 | 59% | 4-4 | 8.08 | 2.14 |
| 2003-06-07 | Chan Ho Park | R | 30 | L 4-5 | @ MON | 7 | 208 | - | 2.0 | 3 | 4 | 3 | 2 | 4 | 1 | 60 | 31 | 29 | 48% | 1-3 | 7.50 | 1.97 |
| 2003-06-08 | Ismael Valdez | R | 30 | L 2-3 | @ MON | 10 | 238 | - | 6.0 | 6 | 2 | 2 | 1 | 1 | 2 | 77 | 24 | 53 | 69% | 5-2 | 4.82 | 1.36 |
| 2003-06-10 | John Thomson | R | 30 | L 9-7 | vs NYN | 14 | 124 | W | 6.0 | 6 | 3 | 3 | 1 | 2 | 4 | 105 | 38 | 67 | 64% | 4-7 | 5.16 | 1.33 |
| 2003-06-11 | Victor Santos | R | 27 | W 2-8 | vs NYN | 2 | 11 | L | 4.2 | 7 | 5 | 5 | 1 | 1 | 3 | 73 | 27 | 46 | 63% | 0-1 | 8.10 | 1.60 |
| 2003-06-12 | Colby Lewis | R | 24 | W 0-11 | vs NYN | 14 | 18 | L | 2.1 | 7 | 6 | 6 | 1 | 1 | 2 | 58 | 20 | 38 | 66% | 4-5 | 8.70 | 2.20 |
| 2003-06-13 | Tony Mounce | L | 28 | W 0-8 | vs FLO | 1 | 1 | L | 4.1 | 9 | 5 | 5 | 1 | 3 | 2 | 82 | 31 | 51 | 62% | 0-1 | 11.25 | 3.00 |
| 2003-06-14 | Ismael Valdez | R | 30 | L 13-2 | vs FLO | 11 | 239 | W | 6.0 | 6 | 2 | 2 | 0 | 1 | 2 | 92 | 33 | 59 | 64% | 6-2 | 4.65 | 1.34 |
| 2003-06-15 | John Thomson | R | 30 | W 4-10 | vs FLO | 15 | 125 | L | 3.2 | 11 | 7 | 7 | 0 | 0 | 0 | 73 | 23 | 50 | 68% | 4-8 | 5.65 | 1.40 |
| 2003-06-17 | Victor Santos | R | 27 | L 3-4 | @ OAK | 3 | 12 | L | 5.2 | 5 | 4 | 3 | 3 | 1 | 3 | 85 | 37 | 48 | 56% | 0-2 | 7.20 | 1.47 |
| 2003-06-18 | Tony Mounce | L | 28 | L 3-4 | @ OAK | 2 | 2 | - | 5.2 | 4 | 1 | 1 | 0 | 2 | 3 | 96 | 39 | 57 | 59% | 0-1 | 5.40 | 1.80 |
| 2003-06-19 | Mario Ramos | L | 26 | L 2-9 | @ OAK | 1 | 1 | L | 3.2 | 5 | 4 | 4 | 2 | 4 | 4 | 85 | 38 | 47 | 55% | 0-1 | 9.00 | 2.25 |
| 2003-06-20 | John Thomson | R | 30 | W 3-12 | vs HOU | 16 | 126 | L | 7.0 | 7 | 5 | 5 | 1 | 2 | 5 | 103 | 39 | 64 | 62% | 4-9 | 5.71 | 1.39 |
| 2003-06-21 | Ismael Valdez | R | 30 | W 5-9 | vs HOU | 12 | 240 | L | 4.0 | 10 | 8 | 8 | 2 | 0 | 1 | 65 | 19 | 46 | 71% | 6-3 | 5.45 | 1.41 |
| 2003-06-22 | Joaquin Benoit | R | 26 | W 1-3 | vs HOU | 7 | 21 | L | 5.2 | 5 | 2 | 2 | 1 | 1 | 8 | 94 | 32 | 62 | 66% | 2-3 | 5.21 | 1.26 |
| 2003-06-23 | Tony Mounce | L | 28 | W 1-3 | vs OAK | 3 | 3 | - | 5.0 | 4 | 0 | 0 | 0 | 5 | 4 | 104 | 46 | 58 | 56% | 0-1 | 3.60 | 1.80 |
| 2003-06-24 | Mario Ramos | L | 26 | L 7-6 | vs OAK | 2 | 2 | W | 6.0 | 4 | 2 | 2 | 1 | 2 | 3 | 97 | 41 | 56 | 58% | 1-1 | 5.40 | 1.50 |
| 2003-06-25 | John Thomson | R | 30 | L 9-8 | vs OAK | 17 | 127 | - | 3.2 | 10 | 6 | 6 | 1 | 0 | 3 | 67 | 21 | 46 | 69% | 4-9 | 6.03 | 1.43 |
| 2003-06-26 | Ismael Valdez | R | 30 | W 0-13 | vs OAK | 13 | 241 | L | 3.1 | 10 | 8 | 8 | 4 | 1 | 3 | 83 | 31 | 52 | 63% | 6-4 | 6.17 | 1.49 |
| 2003-06-27 | Joaquin Benoit | R | 26 | W 10-7 | @ HOU | 8 | 22 | W | 5.0 | 5 | 4 | 4 | 3 | 1 | 4 | 77 | 30 | 47 | 61% | 3-3 | 5.44 | 1.26 |
| 2003-06-28 | Tony Mounce | L | 28 | L 0-2 | @ HOU | 4 | 4 | L | 6.0 | 4 | 2 | 1 | 0 | 4 | 5 | 105 | 45 | 60 | 57% | 0-2 | 3.00 | 1.67 |
| 2003-06-29 | Mario Ramos | L | 26 | W 8-5 | @ HOU | 3 | 3 | - | 3.1 | 2 | 3 | 3 | 0 | 7 | 1 | 75 | 45 | 30 | 40% | 1-1 | 6.23 | 1.85 |
| 2003-06-30 | John Thomson | R | 30 | W 6-3 | @ ANA | 18 | 128 | W | 7.0 | 3 | 3 | 3 | 2 | 1 | 4 | 100 | 33 | 67 | 67% | 5-9 | 5.88 | 1.38 |
| 2003-07-01 | Ismael Valdez | R | 30 | L 5-7 | @ ANA | 14 | 242 | L | 5.0 | 7 | 7 | 6 | 2 | 2 | 1 | 71 | 28 | 43 | 61% | 6-5 | 6.48 | 1.51 |
| 2003-07-02 | Joaquin Benoit | R | 26 | L 0-5 | @ ANA | 9 | 23 | L | 4.2 | 6 | 5 | 5 | 1 | 3 | 2 | 101 | 42 | 59 | 58% | 3-4 | 5.81 | 1.31 |
| 2003-07-03 | Tony Mounce | L | 28 | W 6-5 | @ ANA | 5 | 5 | W | 5.1 | 6 | 3 | 3 | 0 | 0 | 2 | 82 | 29 | 53 | 65% | 1-2 | 3.46 | 1.58 |
| 2003-07-04 | Victor Santos | R | 27 | L 7-3 | vs SEA | 4 | 13 | - | 4.0 | 4 | 3 | 3 | 0 | 5 | 0 | 95 | 46 | 49 | 52% | 0-2 | 6.00 | 1.58 |
| 2003-07-05 | John Thomson | R | 30 | W 2-3 | vs SEA | 19 | 129 | - | 7.0 | 6 | 2 | 2 | 0 | 1 | 5 | 99 | 33 | 66 | 67% | 5-9 | 5.68 | 1.35 |
| 2003-07-06 | Ismael Valdez | R | 30 | L 5-1 | vs SEA | 15 | 243 | W | 6.0 | 4 | 1 | 1 | 1 | 1 | 3 | 93 | 37 | 56 | 60% | 7-5 | 6.11 | 1.46 |
| 2003-07-08 | Tony Mounce | L | 28 | L 8-6 | vs MIN | 6 | 6 | - | 3.0 | 5 | 5 | 5 | 0 | 3 | 0 | 66 | 30 | 36 | 55% | 1-2 | 4.66 | 1.69 |
| 2003-07-09 | Joaquin Benoit | R | 26 | L 4-1 | vs MIN | 10 | 24 | W | 7.0 | 4 | 1 | 1 | 1 | 3 | 5 | 107 | 41 | 66 | 62% | 4-4 | 5.24 | 1.27 |
| 2003-07-10 | John Thomson | R | 30 | L 9-4 | vs MIN | 20 | 130 | W | 7.0 | 8 | 2 | 1 | 0 | 2 | 4 | 103 | 34 | 69 | 67% | 6-9 | 5.42 | 1.36 |
| 2003-07-11 | R.A. Dickey | R | 29 | W 3-13 | vs KCA | 1 | 1 | L | 5.0 | 6 | 4 | 4 | 1 | 1 | 1 | 73 | 26 | 47 | 64% | 4-4 | 5.00 | 1.64 |
| 2003-07-12 | Ismael Valdez | R | 30 | W 2-8 | vs KCA | 16 | 244 | L | 4.2 | 8 | 4 | 4 | 1 | 1 | 0 | 90 | 35 | 55 | 61% | 7-6 | 6.25 | 1.49 |
| 2003-07-13 | Tony Mounce | L | 28 | W 2-8 | vs KCA | 7 | 7 | L | 4.0 | 8 | 6 | 6 | 2 | 1 | 3 | 73 | 30 | 43 | 59% | 1-3 | 5.73 | 1.76 |
| 2003-07-17 | John Thomson | R | 30 | W 12-6 | @ TBA | 21 | 131 | W | 7.2 | 7 | 3 | 3 | 0 | 0 | 9 | 95 | 24 | 71 | 75% | 7-9 | 5.33 | 1.34 |
| 2003-07-18 | Ismael Valdez | R | 30 | L 0-2 | @ TBA | 17 | 245 | L | 7.0 | 6 | 1 | 1 | 0 | 0 | 3 | 119 | 39 | 80 | 67% | 7-7 | 5.87 | 1.45 |
| 2003-07-19 | Joaquin Benoit | R | 26 | W 7-3 | @ TBA | 11 | 25 | W | 5.0 | 6 | 3 | 3 | 0 | 2 | 2 | 94 | 36 | 58 | 62% | 5-4 | 5.23 | 1.29 |
| 2003-07-20 | Tony Mounce | L | 28 | L 4-15 | @ TBA | 8 | 8 | L | 3.1 | 7 | 6 | 5 | 1 | 4 | 4 | 95 | 39 | 56 | 59% | 1-4 | 6.32 | 1.86 |
| 2003-07-21 | R.A. Dickey | R | 29 | L 2-3 | @ BAL | 2 | 2 | L | 6.0 | 6 | 3 | 3 | 1 | 0 | 3 | 79 | 24 | 55 | 70% | 4-5 | 4.94 | 1.57 |
| 2003-07-22 | John Thomson | R | 30 | L 6-12 | @ BAL | 22 | 132 | L | 3.2 | 7 | 7 | 6 | 0 | 2 | 2 | 89 | 32 | 57 | 64% | 7-10 | 5.58 | 1.36 |
| 2003-07-23 | Ismael Valdez | R | 30 | L 12-9 | vs ANA | 18 | 246 | - | 2.1 | 9 | 6 | 6 | 1 | 3 | 0 | 54 | 21 | 33 | 61% | 7-7 | 6.25 | 1.53 |
| 2003-07-24 | Joaquin Benoit | R | 26 | W 6-10 | vs ANA | 12 | 26 | L | 3.2 | 7 | 5 | 5 | 0 | 4 | 2 | 86 | 35 | 51 | 59% | 5-5 | 5.68 | 1.40 |
| 2003-07-25 | Robert Ellis | R | 33 | L 5-11 | @ SEA | 1 | 18 | L | 4.0 | 7 | 8 | 8 | 3 | 3 | 0 | 82 | 35 | 47 | 57% | 0-1 | 18.00 | 2.50 |
| 2003-07-26 | Colby Lewis | R | 24 | L 0-4 | @ SEA | 15 | 19 | L | 5.2 | 8 | 3 | 3 | 0 | 0 | 1 | 101 | 33 | 68 | 67% | 4-6 | 8.33 | 2.12 |
| 2003-07-27 | John Thomson | R | 30 | W 7-3 | @ SEA | 23 | 133 | W | 8.0 | 8 | 3 | 3 | 1 | 5 | 7 | 125 | 49 | 76 | 61% | 8-10 | 5.45 | 1.38 |
| 2003-07-28 | Joaquin Benoit | R | 26 | W 10-1 | @ SEA | 13 | 27 | W | 7.0 | 2 | 0 | 0 | 0 | 2 | 7 | 104 | 37 | 67 | 64% | 6-5 | 5.13 | 1.32 |
| 2003-07-29 | R.A. Dickey | R | 29 | W 7-14 | vs BOS | 3 | 3 | - | 5.0 | 7 | 2 | 2 | 2 | 1 | 6 | 95 | 36 | 59 | 62% | 4-5 | 4.97 | 1.59 |
| 2003-07-30 | Robert Ellis | R | 33 | L 9-2 | vs BOS | 2 | 19 | W | 7.0 | 6 | 2 | 2 | 2 | 3 | 5 | 109 | 46 | 63 | 58% | 1-1 | 8.18 | 1.73 |
| 2003-07-31 | Colby Lewis | R | 24 | L 7-3 | vs BOS | 16 | 20 | - | 6.0 | 8 | 2 | 2 | 1 | 2 | 6 | 104 | 37 | 67 | 64% | 4-6 | 7.89 | 2.08 |
| 2003-08-01 | John Thomson | R | 30 | L 10-3 | vs CLE | 24 | 134 | W | 8.0 | 5 | 3 | 3 | 1 | 0 | 1 | 92 | 32 | 60 | 65% | 9-10 | 5.34 | 1.34 |
| 2003-08-02 | Joaquin Benoit | R | 26 | L 9-7 | vs CLE | 14 | 28 | - | 4.2 | 8 | 6 | 5 | 3 | 3 | 3 | 97 | 41 | 56 | 58% | 6-5 | 5.38 | 1.38 |
| 2003-08-03 | R.A. Dickey | R | 29 | L 8-5 | vs CLE | 4 | 4 | W | 7.0 | 7 | 4 | 4 | 1 | 1 | 5 | 106 | 35 | 71 | 67% | 5-5 | 4.98 | 1.54 |
| 2003-08-05 | Colby Lewis | R | 24 | L 2-6 | @ NYA | 17 | 21 | L | 4.2 | 7 | 6 | 6 | 4 | 1 | 2 | 91 | 36 | 55 | 60% | 4-7 | 8.08 | 2.05 |
| 2003-08-06 | John Thomson | R | 30 | W 5-4 | @ NYA | 25 | 135 | - | 6.0 | 7 | 4 | 4 | 2 | 4 | 4 | 110 | 44 | 66 | 60% | 9-10 | 5.36 | 1.36 |
| 2003-08-07 | Joaquin Benoit | R | 26 | L 5-7 | @ NYA | 15 | 29 | - | 1.2 | 3 | 4 | 4 | 1 | 3 | 4 | 59 | 28 | 31 | 53% | 6-5 | 5.70 | 1.42 |
| 2003-08-08 | R.A. Dickey | R | 29 | W 5-3 | @ TOR | 5 | 5 | W | 6.0 | 6 | 3 | 3 | 1 | 1 | 6 | 112 | 41 | 71 | 63% | 6-5 | 4.94 | 1.51 |
| 2003-08-09 | Robert Ellis | R | 33 | L 3-5 | @ TOR | 3 | 20 | - | 5.1 | 7 | 2 | 2 | 0 | 3 | 2 | 89 | 31 | 58 | 65% | 1-1 | 6.75 | 1.81 |
| 2003-08-10 | Colby Lewis | R | 24 | W 5-4 | @ TOR | 18 | 22 | W | 5.0 | 7 | 2 | 2 | 1 | 1 | 5 | 82 | 25 | 57 | 70% | 5-7 | 7.81 | 2.02 |
| 2003-08-11 | John Thomson | R | 30 | L 9-3 | vs DET | 26 | 136 | - | 1.2 | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 7 | 13 | 65% | 9-10 | 5.29 | 1.34 |
| 2003-08-12 | Juan Dominguez | R | 23 | W 4-7 | vs DET | 1 | 1 | L | 4.2 | 7 | 4 | 4 | 2 | 0 | 4 | 68 | 19 | 49 | 72% | 0-1 | 7.20 | 1.40 |
| 2003-08-13 | R.A. Dickey | R | 29 | L 7-3 | vs DET | 6 | 6 | W | 6.0 | 7 | 3 | 3 | 1 | 2 | 3 | 101 | 38 | 63 | 62% | 7-5 | 4.91 | 1.51 |
| 2003-08-14 | John Thomson | R | 30 | L 6-3 | vs DET | 27 | 137 | W | 7.0 | 9 | 3 | 3 | 0 | 0 | 6 | 83 | 24 | 59 | 71% | 10-10 | 5.23 | 1.34 |
| 2003-08-15 | Colby Lewis | R | 24 | L 11-5 | vs CHA | 19 | 23 | W | 7.2 | 7 | 4 | 4 | 0 | 2 | 10 | 117 | 39 | 78 | 67% | 6-7 | 7.60 | 1.97 |
| 2003-08-16 | Robert Ellis | R | 33 | L 12-8 | vs CHA | 4 | 21 | - | 2.0 | 6 | 5 | 5 | 2 | 1 | 1 | 44 | 15 | 29 | 66% | 1-1 | 8.50 | 2.00 |
| 2003-08-17 | Juan Dominguez | R | 23 | L 6-4 | vs CHA | 2 | 2 | - | 4.0 | 4 | 4 | 4 | 1 | 2 | 5 | 89 | 37 | 52 | 58% | 0-1 | 8.00 | 1.44 |
| 2003-08-18 | Ismael Valdez | R | 30 | W 4-2 | @ DET | 19 | 247 | - | 6.1 | 3 | 1 | 1 | 1 | 3 | 2 | 82 | 34 | 48 | 59% | 7-7 | 5.97 | 1.50 |
| 2003-08-19 | John Thomson | R | 30 | W 5-4 | @ DET | 28 | 138 | W | 8.0 | 11 | 4 | 4 | 1 | 4 | 3 | 123 | 44 | 79 | 64% | 11-10 | 5.20 | 1.36 |
| 2003-08-20 | R.A. Dickey | R | 29 | W 6-0 | @ DET | 7 | 7 | W | 9.0 | 6 | 0 | 0 | 0 | 1 | 7 | 122 | 43 | 79 | 65% | 8-5 | 4.34 | 1.41 |
| 2003-08-21 | Colby Lewis | R | 24 | L 3-7 | @ CHA | 20 | 24 | L | 5.2 | 8 | 5 | 5 | 2 | 4 | 2 | 108 | 43 | 65 | 60% | 6-8 | 7.59 | 1.97 |
| 2003-08-22 | Juan Dominguez | R | 23 | L 1-7 | @ CHA | 3 | 3 | L | 5.1 | 3 | 5 | 4 | 2 | 6 | 2 | 92 | 40 | 52 | 57% | 0-2 | 7.71 | 1.57 |
| 2003-08-23 | Ismael Valdez | R | 30 | L 2-13 | @ CHA | 20 | 248 | L | 3.2 | 9 | 7 | 7 | 3 | 1 | 1 | 65 | 26 | 39 | 60% | 7-8 | 6.34 | 1.53 |
| 2003-08-24 | John Thomson | R | 30 | W 5-0 | @ CHA | 29 | 139 | W | 9.0 | 4 | 0 | 0 | 0 | 1 | 6 | 108 | 31 | 77 | 71% | 12-10 | 4.93 | 1.32 |
| 2003-08-26 | R.A. Dickey | R | 29 | L 2-9 | @ KCA | 8 | 8 | L | 5.1 | 6 | 6 | 6 | 1 | 3 | 5 | 96 | 42 | 54 | 56% | 8-6 | 4.70 | 1.43 |
| 2003-08-27 | Colby Lewis | R | 24 | L 0-9 | @ KCA | 21 | 25 | L | 1.1 | 5 | 7 | 7 | 0 | 3 | 1 | 59 | 24 | 35 | 59% | 6-9 | 8.16 | 2.03 |
| 2003-08-28 | Ismael Valdez | R | 30 | L 5-6 | @ KCA | 21 | 249 | - | 5.1 | 6 | 2 | 1 | 0 | 2 | 1 | 73 | 24 | 49 | 67% | 7-8 | 6.14 | 1.54 |
| 2003-08-29 | John Thomson | R | 30 | W 5-8 | vs MIN | 30 | 140 | L | 7.2 | 8 | 6 | 6 | 1 | 1 | 2 | 101 | 34 | 67 | 66% | 12-11 | 5.04 | 1.32 |
| 2003-08-30 | Mickey Callaway | R | 28 | W 0-2 | vs MIN | 5 | 15 | L | 6.0 | 5 | 2 | 2 | 0 | 0 | 4 | 83 | 32 | 51 | 61% | 1-5 | 6.34 | 1.77 |
| 2003-08-31 | R.A. Dickey | R | 29 | L 11-10 | vs MIN | 9 | 9 | - | 4.2 | 8 | 6 | 5 | 1 | 4 | 4 | 103 | 46 | 57 | 55% | 8-6 | 4.92 | 1.48 |
| 2003-09-01 | Colby Lewis | R | 24 | L 7-3 | vs KCA | 22 | 26 | W | 7.0 | 4 | 3 | 3 | 2 | 0 | 2 | 90 | 32 | 58 | 64% | 7-9 | 7.88 | 1.93 |
| 2003-09-02 | Ismael Valdez | R | 30 | L 8-7 | vs KCA | 22 | 250 | W | 5.0 | 6 | 3 | 3 | 1 | 2 | 2 | 80 | 29 | 51 | 64% | 8-8 | 6.10 | 1.54 |
| 2003-09-03 | John Thomson | R | 30 | W 1-3 | vs KCA | 31 | 141 | L | 7.0 | 4 | 3 | 3 | 0 | 1 | 8 | 105 | 37 | 68 | 65% | 12-12 | 4.99 | 1.30 |
| 2003-09-05 | Mickey Callaway | R | 28 | L 7-10 | @ MIN | 6 | 16 | L | 2.2 | 7 | 7 | 7 | 0 | 3 | 1 | 72 | 29 | 43 | 60% | 1-6 | 7.28 | 1.87 |
| 2003-09-06 | R.A. Dickey | R | 29 | L 2-5 | @ MIN | 10 | 10 | L | 2.2 | 6 | 5 | 5 | 1 | 3 | 2 | 76 | 28 | 48 | 63% | 8-7 | 5.22 | 1.53 |
| 2003-09-07 | Colby Lewis | R | 24 | L 4-5 | @ MIN | 23 | 27 | - | 4.2 | 3 | 3 | 3 | 1 | 3 | 1 | 104 | 45 | 59 | 57% | 7-9 | 7.76 | 1.90 |
| 2003-09-09 | Tony Mounce | L | 29 | W 5-4 | @ SEA | 9 | 9 | - | 5.0 | 6 | 4 | 4 | 1 | 0 | 1 | 76 | 27 | 49 | 64% | 1-4 | 6.43 | 1.79 |
| 2003-09-10 | John Thomson | R | 30 | L 1-3 | @ SEA | 32 | 142 | L | 6.2 | 4 | 3 | 3 | 1 | 1 | 2 | 99 | 36 | 63 | 64% | 12-13 | 4.95 | 1.28 |
| 2003-09-11 | Mickey Callaway | R | 28 | L 2-8 | @ SEA | 7 | 17 | L | 4.0 | 6 | 6 | 6 | 0 | 4 | 5 | 94 | 40 | 54 | 57% | 1-7 | 7.76 | 1.92 |
| 2003-09-12 | Ryan Drese | R | 27 | W 3-9 | vs OAK | 6 | 36 | L | 6.1 | 4 | 4 | 4 | 0 | 3 | 1 | 91 | 39 | 52 | 57% | 2-3 | 7.71 | 2.00 |
| 2003-09-13 | R.A. Dickey | R | 29 | W 3-9 | vs OAK | 11 | 11 | L | 4.0 | 6 | 4 | 4 | 1 | 1 | 2 | 84 | 29 | 55 | 65% | 8-8 | 5.37 | 1.54 |
| 2003-09-14 | Tony Mounce | L | 29 | W 5-6 | vs OAK | 10 | 10 | - | 6.0 | 5 | 5 | 5 | 2 | 1 | 5 | 88 | 31 | 57 | 65% | 1-4 | 6.56 | 1.69 |
| 2003-09-15 | Colby Lewis | R | 24 | L 6-4 | vs SEA | 24 | 28 | W | 6.0 | 9 | 4 | 4 | 0 | 2 | 3 | 89 | 30 | 59 | 66% | 8-9 | 7.67 | 1.90 |
| 2003-09-16 | John Thomson | R | 30 | L 10-5 | vs SEA | 33 | 143 | W | 8.0 | 9 | 3 | 3 | 0 | 1 | 5 | 104 | 39 | 65 | 63% | 13-13 | 4.89 | 1.28 |
| 2003-09-17 | Ryan Drese | R | 27 | W 1-5 | vs SEA | 7 | 37 | L | 3.1 | 6 | 5 | 4 | 1 | 2 | 0 | 62 | 26 | 36 | 58% | 2-4 | 7.85 | 2.00 |
| 2003-09-18 | Joaquin Benoit | R | 26 | L 2-1 | vs SEA | 16 | 30 | - | 4.0 | 1 | 0 | 0 | 0 | 0 | 5 | 59 | 20 | 39 | 66% | 8-5 | 5.52 | 1.42 |
| 2003-09-19 | R.A. Dickey | R | 29 | L 3-2 | vs ANA | 12 | 12 | W | 6.0 | 5 | 1 | 1 | 1 | 1 | 6 | 106 | 40 | 66 | 62% | 9-8 | 5.15 | 1.51 |
| 2003-09-20 | Colby Lewis | R | 24 | L 13-4 | vs ANA | 25 | 29 | W | 7.0 | 4 | 2 | 2 | 1 | 1 | 6 | 90 | 33 | 57 | 63% | 9-9 | 7.38 | 1.83 |
| 2003-09-21 | John Thomson | R | 30 | W 6-11 | vs ANA | 34 | 144 | - | 6.0 | 7 | 2 | 2 | 1 | 4 | 4 | 112 | 44 | 68 | 61% | 13-13 | 4.84 | 1.29 |
| 2003-09-22 | Tony Mounce | L | 29 | L 3-7 | @ OAK | 11 | 11 | L | 3.0 | 7 | 5 | 5 | 2 | 2 | 1 | 73 | 33 | 40 | 55% | 1-5 | 7.06 | 1.76 |
| 2003-09-23 | Ryan Drese | R | 27 | L 3-4 | @ OAK | 8 | 38 | - | 7.1 | 7 | 2 | 1 | 0 | 0 | 2 | 96 | 34 | 62 | 65% | 2-4 | 6.85 | 1.85 |
| 2003-09-24 | Joaquin Benoit | R | 26 | L 3-5 | @ OAK | 17 | 31 | - | 4.0 | 2 | 2 | 2 | 1 | 5 | 5 | 99 | 44 | 55 | 56% | 8-5 | 5.49 | 1.43 |
| 2003-09-26 | R.A. Dickey | R | 29 | L 3-5 | @ ANA | 13 | 13 | - | 7.0 | 6 | 3 | 3 | 0 | 1 | 5 | 112 | 43 | 69 | 62% | 9-8 | 5.08 | 1.48 |
| 2003-09-27 | Colby Lewis | R | 24 | W 12-3 | @ ANA | 26 | 30 | W | 5.0 | 7 | 2 | 3 | 0 | 3 | 4 | 85 | 34 | 51 | 60% | 10-9 | 7.30 | 1.83 |
| 2003-09-28 | John Thomson | R | 30 | L 1-4 | @ ANA | 35 | 145 | L | 5.0 | 8 | 3 | 3 | 1 | 1 | 4 | 96 | 35 | 61 | 64% | 13-14 | 4.85 | 1.30 |