| West | W | L | Pct | GB |
| SF Giants | 100 | 61 | .621 | -- |
| LA Dodgers | 85 | 77 | .525 | 15.5 |
| Arizona | 84 | 78 | .519 | 16.5 |
| Colorado | 74 | 88 | .457 | 26.5 |
| San Diego | 64 | 98 | .395 | 36.5 |
| 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 |
| 2003-03-31 | Randy Johnson | L | 40 | W 0-8 | vs LAN | 1 | 427 | L | 6.2 | 9 | 5 | 3 | 1 | 2 | 5 | 96 | 31 | 65 | 68% | 0-1 | 3.86 | 1.57 |
| 2003-04-01 | Curt Schilling | R | 36 | L 5-4 | vs LAN | 1 | 315 | - | 7.1 | 5 | 4 | 4 | 1 | 2 | 5 | 114 | 39 | 75 | 66% | 0-0 | 5.14 | 1.00 |
| 2003-04-02 | Elmer Dessens | R | 31 | W 0-5 | vs LAN | 1 | 89 | L | 5.0 | 8 | 4 | 4 | 2 | 1 | 3 | 80 | 29 | 51 | 64% | 0-1 | 7.20 | 1.80 |
| 2003-04-04 | Byung-Hyun Kim | R | 24 | L 1-2 | @ COL | 1 | 2 | L | 5.0 | 5 | 2 | 2 | 1 | 1 | 3 | 94 | 33 | 61 | 65% | 0-1 | 3.60 | 1.20 |
| 2003-04-05 | Randy Johnson | L | 40 | L 3-4 | @ COL | 2 | 428 | - | 6.0 | 2 | 3 | 3 | 2 | 1 | 10 | 96 | 37 | 59 | 61% | 0-1 | 4.15 | 1.08 |
| 2003-04-06 | Curt Schilling | R | 36 | L 3-8 | @ COL | 2 | 316 | L | 5.0 | 6 | 5 | 5 | 1 | 3 | 7 | 101 | 42 | 59 | 58% | 0-1 | 6.75 | 1.33 |
| 2003-04-07 | Elmer Dessens | R | 31 | W 6-4 | @ LAN | 2 | 90 | - | 6.0 | 6 | 3 | 3 | 2 | 1 | 3 | 94 | 35 | 59 | 63% | 0-1 | 5.73 | 1.45 |
| 2003-04-08 | Oscar Villarreal | R | 21 | L 3-5 | @ LAN | 1 | 1 | - | 3.0 | 4 | 2 | 2 | 0 | 3 | 2 | 73 | 33 | 40 | 55% | 0-0 | 2.57 | 1.57 |
| 2003-04-09 | Byung-Hyun Kim | R | 24 | L 2-5 | @ LAN | 2 | 3 | L | 6.0 | 5 | 4 | 4 | 1 | 3 | 5 | 96 | 37 | 59 | 61% | 0-2 | 4.91 | 1.27 |
| 2003-04-11 | Randy Johnson | L | 40 | W 7-11 | vs MIL | 3 | 429 | L | 4.2 | 10 | 10 | 10 | 0 | 2 | 4 | 80 | 33 | 47 | 59% | 0-2 | 8.47 | 1.53 |
| 2003-04-12 | Curt Schilling | R | 36 | W 2-3 | vs MIL | 3 | 317 | L | 6.0 | 4 | 3 | 2 | 0 | 4 | 10 | 102 | 35 | 67 | 66% | 0-2 | 5.50 | 1.33 |
| 2003-04-13 | Elmer Dessens | R | 31 | L 9-3 | vs MIL | 3 | 91 | W | 6.2 | 7 | 2 | 2 | 1 | 3 | 5 | 108 | 40 | 68 | 63% | 1-1 | 4.50 | 1.44 |
| 2003-04-14 | Byung-Hyun Kim | R | 24 | W 3-5 | vs COL | 3 | 4 | L | 6.0 | 5 | 1 | 1 | 1 | 1 | 6 | 91 | 32 | 59 | 65% | 0-3 | 3.71 | 1.18 |
| 2003-04-15 | John Patterson | R | 25 | W 1-12 | vs COL | 1 | 6 | L | 4.0 | 5 | 5 | 5 | 2 | 5 | 3 | 77 | 37 | 40 | 52% | 0-1 | 11.25 | 2.50 |
| 2003-04-16 | Miguel Batista | R | 32 | L 4-3 | vs COL | 1 | 93 | - | 6.0 | 5 | 2 | 1 | 0 | 3 | 1 | 89 | 36 | 53 | 60% | 0-2 | 4.20 | 1.53 |
| 2003-04-17 | Curt Schilling | R | 36 | L 11-2 | vs COL | 4 | 318 | W | 9.0 | 4 | 2 | 2 | 1 | 0 | 10 | 102 | 24 | 78 | 76% | 1-2 | 4.33 | 1.04 |
| 2003-04-18 | Elmer Dessens | R | 31 | L 3-6 | @ SLN | 4 | 92 | L | 5.0 | 8 | 5 | 5 | 0 | 4 | 1 | 106 | 43 | 63 | 59% | 1-2 | 5.48 | 1.65 |
| 2003-04-19 | Byung-Hyun Kim | R | 24 | W 4-3 | @ SLN | 4 | 5 | W | 7.0 | 5 | 3 | 3 | 0 | 3 | 1 | 99 | 37 | 62 | 63% | 1-3 | 3.75 | 1.17 |
| 2003-04-20 | Miguel Batista | R | 32 | W 1-0 | @ SLN | 2 | 94 | - | 4.1 | 3 | 0 | 0 | 0 | 0 | 1 | 48 | 17 | 31 | 65% | 0-2 | 3.15 | 1.30 |
| 2003-04-22 | Andrew Good | R | 24 | L 0-4 | @ MON | 1 | 1 | L | 4.2 | 5 | 4 | 4 | 2 | 4 | 5 | 96 | 37 | 59 | 61% | 0-1 | 7.20 | 1.80 |
| 2003-04-23 | Elmer Dessens | R | 31 | W 6-2 | @ MON | 5 | 93 | W | 6.0 | 5 | 2 | 1 | 0 | 2 | 3 | 102 | 42 | 60 | 59% | 2-2 | 4.66 | 1.55 |
| 2003-04-24 | Byung-Hyun Kim | R | 24 | L 0-1 | @ MON | 5 | 6 | L | 7.0 | 3 | 1 | 1 | 1 | 2 | 5 | 106 | 38 | 68 | 64% | 1-4 | 3.19 | 1.06 |
| 2003-04-25 | Miguel Batista | R | 32 | L 3-4 | @ NYN | 3 | 95 | - | 5.2 | 5 | 3 | 3 | 0 | 4 | 3 | 85 | 37 | 48 | 56% | 0-2 | 3.60 | 1.40 |
| 2003-04-27 | Brandon Webb | R | 24 | W 6-1 | @ NYN | 1 | 1 | W | 7.0 | 3 | 0 | 0 | 0 | 1 | 10 | 98 | 37 | 61 | 62% | 1-0 | 0.00 | 0.63 |
| 2003-04-27 | Randy Johnson | L | 40 | W 7-3 | @ NYN | 4 | 430 | W | 6.0 | 9 | 2 | 2 | 0 | 0 | 12 | 109 | 32 | 77 | 71% | 1-2 | 7.04 | 1.52 |
| 2003-04-28 | Elmer Dessens | R | 31 | L 7-1 | vs FLO | 6 | 94 | W | 7.0 | 5 | 1 | 1 | 0 | 2 | 5 | 105 | 40 | 65 | 62% | 3-2 | 4.00 | 1.44 |
| 2003-04-29 | Byung-Hyun Kim | R | 24 | W 5-7 | vs FLO | 6 | 7 | L | 5.0 | 6 | 5 | 5 | 2 | 2 | 7 | 90 | 31 | 59 | 66% | 1-5 | 4.00 | 1.14 |
| 2003-04-30 | Miguel Batista | R | 32 | L 7-3 | vs FLO | 4 | 96 | W | 7.0 | 6 | 1 | 1 | 1 | 2 | 6 | 98 | 32 | 66 | 67% | 1-2 | 3.09 | 1.34 |
| 2003-05-01 | Andrew Good | R | 24 | W 3-4 | vs FLO | 2 | 2 | - | 7.0 | 6 | 3 | 3 | 0 | 2 | 1 | 94 | 35 | 59 | 63% | 0-1 | 5.25 | 1.42 |
| 2003-05-02 | Brandon Webb | R | 24 | W 2-4 | vs ATL | 2 | 2 | - | 7.0 | 3 | 1 | 1 | 0 | 3 | 3 | 104 | 45 | 59 | 57% | 1-0 | 0.60 | 0.73 |
| 2003-05-03 | Curt Schilling | R | 36 | L 7-6 | vs ATL | 5 | 319 | - | 5.0 | 8 | 5 | 5 | 2 | 3 | 4 | 108 | 43 | 65 | 60% | 1-2 | 5.06 | 1.22 |
| 2003-05-04 | Elmer Dessens | R | 31 | W 4-7 | vs ATL | 7 | 95 | - | 6.0 | 7 | 4 | 4 | 1 | 4 | 3 | 94 | 39 | 55 | 59% | 3-2 | 4.29 | 1.50 |
| 2003-05-05 | Miguel Batista | R | 32 | L 10-1 | vs PHI | 5 | 97 | W | 9.0 | 7 | 1 | 0 | 0 | 0 | 5 | 121 | 45 | 76 | 63% | 2-2 | 2.41 | 1.22 |
| 2003-05-06 | Andrew Good | R | 24 | L 6-5 | vs PHI | 3 | 3 | - | 5.0 | 8 | 5 | 5 | 3 | 0 | 1 | 70 | 21 | 49 | 70% | 0-1 | 6.35 | 1.47 |
| 2003-05-07 | Brandon Webb | R | 24 | W 2-5 | vs PHI | 3 | 3 | L | 7.0 | 5 | 3 | 3 | 2 | 3 | 7 | 107 | 46 | 61 | 57% | 1-1 | 1.64 | 0.86 |
| 2003-05-09 | Curt Schilling | R | 36 | W 5-0 | @ PIT | 6 | 320 | W | 9.0 | 4 | 0 | 0 | 0 | 0 | 10 | 103 | 27 | 76 | 74% | 2-2 | 3.95 | 1.05 |
| 2003-05-10 | Elmer Dessens | R | 31 | L 4-5 | @ PIT | 8 | 96 | L | 6.0 | 5 | 4 | 4 | 3 | 0 | 5 | 94 | 33 | 61 | 65% | 3-3 | 4.50 | 1.42 |
| 2003-05-11 | Miguel Batista | R | 32 | W 2-1 | @ PIT | 6 | 98 | W | 6.0 | 5 | 1 | 1 | 0 | 1 | 6 | 90 | 33 | 57 | 63% | 3-2 | 2.30 | 1.19 |
| 2003-05-13 | Brandon Webb | R | 24 | W 6-1 | @ PHI | 4 | 4 | - | 6.0 | 5 | 1 | 1 | 1 | 2 | 2 | 106 | 43 | 63 | 59% | 1-1 | 1.61 | 0.93 |
| 2003-05-14 | Curt Schilling | R | 36 | W 2-0 | @ PHI | 7 | 321 | W | 9.0 | 2 | 0 | 0 | 0 | 1 | 14 | 106 | 31 | 75 | 71% | 3-2 | 3.24 | 0.92 |
| 2003-05-15 | Elmer Dessens | R | 31 | L 4-6 | @ PHI | 9 | 97 | - | 5.0 | 4 | 2 | 2 | 1 | 6 | 3 | 98 | 48 | 50 | 51% | 3-3 | 4.42 | 1.47 |
| 2003-05-16 | Miguel Batista | R | 32 | W 5-8 | vs PIT | 7 | 99 | - | 5.0 | 8 | 5 | 4 | 1 | 2 | 3 | 79 | 33 | 46 | 58% | 3-2 | 2.77 | 1.27 |
| 2003-05-17 | Chris Capuano | L | 24 | W 5-8 | vs PIT | 1 | 1 | L | 4.2 | 6 | 7 | 7 | 1 | 2 | 2 | 78 | 31 | 47 | 60% | 0-2 | 10.13 | 1.63 |
| 2003-05-18 | Brandon Webb | R | 24 | L 8-6 | vs PIT | 5 | 5 | W | 7.2 | 8 | 3 | 3 | 0 | 3 | 6 | 93 | 33 | 60 | 65% | 2-1 | 2.00 | 1.03 |
| 2003-05-19 | Curt Schilling | R | 37 | L 4-3 | vs SFN | 8 | 322 | - | 7.0 | 7 | 3 | 3 | 2 | 2 | 7 | 120 | 43 | 77 | 64% | 3-2 | 3.32 | 0.96 |
| 2003-05-20 | Elmer Dessens | R | 31 | W 5-6 | vs SFN | 10 | 98 | L | 4.1 | 8 | 5 | 4 | 1 | 2 | 1 | 68 | 29 | 39 | 57% | 3-4 | 4.74 | 1.54 |
| 2003-05-21 | Miguel Batista | R | 32 | W 0-6 | vs SFN | 8 | 100 | L | 6.0 | 7 | 5 | 5 | 1 | 2 | 0 | 78 | 27 | 51 | 65% | 3-3 | 3.26 | 1.29 |
| 2003-05-23 | Brandon Webb | R | 24 | L 5-3 | vs SDN | 6 | 6 | - | 6.1 | 7 | 2 | 2 | 0 | 1 | 6 | 87 | 28 | 59 | 68% | 2-1 | 2.14 | 1.07 |
| 2003-05-24 | Curt Schilling | R | 37 | W 1-5 | vs SDN | 9 | 323 | L | 7.0 | 9 | 3 | 3 | 1 | 2 | 11 | 126 | 40 | 86 | 68% | 3-3 | 3.38 | 1.03 |
| 2003-05-25 | Elmer Dessens | R | 31 | L 9-5 | vs SDN | 11 | 99 | W | 5.2 | 9 | 5 | 5 | 0 | 0 | 6 | 99 | 37 | 62 | 63% | 4-4 | 5.00 | 1.54 |
| 2003-05-26 | Andrew Good | R | 24 | L 8-4 | vs SDN | 4 | 4 | W | 7.0 | 6 | 3 | 3 | 1 | 0 | 7 | 106 | 33 | 73 | 69% | 1-1 | 5.14 | 1.29 |
| 2003-05-27 | Byung-Hyun Kim | R | 24 | L 3-4 | @ SFN | 7 | 8 | - | 7.0 | 5 | 1 | 1 | 0 | 3 | 6 | 107 | 37 | 70 | 65% | 1-5 | 3.56 | 1.14 |
| 2003-05-28 | John Patterson | R | 25 | L 2-10 | @ SFN | 2 | 7 | L | 6.0 | 7 | 6 | 6 | 2 | 4 | 4 | 113 | 48 | 65 | 58% | 0-2 | 9.90 | 2.10 |
| 2003-05-30 | Curt Schilling | R | 37 | W 8-3 | @ SDN | 10 | 324 | W | 6.2 | 4 | 0 | 0 | 0 | 0 | 4 | 64 | 14 | 50 | 78% | 4-3 | 3.04 | 0.99 |
| 2003-05-31 | Elmer Dessens | R | 31 | L 7-8 | @ SDN | 12 | 100 | - | 5.0 | 11 | 6 | 6 | 1 | 0 | 3 | 89 | 34 | 55 | 62% | 4-4 | 5.43 | 1.59 |
| 2003-06-01 | Edgar Gonzalez | R | 20 | W 10-4 | @ SDN | 1 | 1 | W | 5.2 | 10 | 3 | 3 | 1 | 3 | 4 | 99 | 40 | 59 | 60% | 1-0 | 4.50 | 2.17 |
| 2003-06-02 | John Patterson | R | 25 | L 1-4 | @ SDN | 3 | 8 | L | 5.0 | 8 | 4 | 4 | 0 | 4 | 3 | 99 | 46 | 53 | 54% | 0-3 | 9.00 | 2.20 |
| 2003-06-03 | Miguel Batista | R | 32 | L 2-1 | vs CHA | 9 | 101 | - | 8.0 | 5 | 1 | 1 | 0 | 4 | 6 | 119 | 49 | 70 | 59% | 3-3 | 3.00 | 1.27 |
| 2003-06-04 | Andrew Good | R | 24 | L 8-6 | vs CHA | 5 | 5 | W | 6.0 | 5 | 3 | 3 | 1 | 1 | 3 | 91 | 33 | 58 | 64% | 2-1 | 5.03 | 1.24 |
| 2003-06-05 | Elmer Dessens | R | 31 | W 2-3 | vs CHA | 13 | 101 | - | 6.0 | 5 | 2 | 2 | 2 | 3 | 6 | 113 | 48 | 65 | 58% | 4-4 | 5.23 | 1.57 |
| 2003-06-06 | Edgar Gonzalez | R | 20 | W 3-6 | vs CLE | 2 | 2 | L | 5.1 | 10 | 4 | 4 | 0 | 1 | 5 | 95 | 33 | 62 | 65% | 1-1 | 5.73 | 2.18 |
| 2003-06-07 | John Patterson | R | 25 | L 5-3 | vs CLE | 4 | 9 | - | 4.0 | 3 | 3 | 3 | 0 | 2 | 5 | 80 | 32 | 48 | 60% | 0-3 | 8.53 | 2.00 |
| 2003-06-08 | Brandon Webb | R | 24 | L 13-3 | vs CLE | 7 | 7 | W | 7.0 | 5 | 3 | 2 | 1 | 2 | 6 | 105 | 34 | 71 | 68% | 3-1 | 2.20 | 1.06 |
| 2003-06-10 | Elmer Dessens | R | 31 | L 3-7 | @ KCA | 14 | 102 | - | 5.1 | 7 | 3 | 3 | 0 | 0 | 0 | 81 | 25 | 56 | 69% | 4-4 | 5.24 | 1.56 |
| 2003-06-11 | Andrew Good | R | 24 | W 4-3 | @ KCA | 6 | 6 | W | 6.0 | 6 | 2 | 0 | 0 | 2 | 2 | 103 | 38 | 65 | 63% | 3-1 | 4.07 | 1.29 |
| 2003-06-13 | Brandon Webb | R | 24 | L 1-3 | @ MIN | 8 | 8 | L | 6.0 | 6 | 3 | 3 | 0 | 1 | 8 | 96 | 33 | 63 | 66% | 3-2 | 2.45 | 1.07 |
| 2003-06-14 | Miguel Batista | R | 32 | W 9-2 | @ MIN | 10 | 102 | W | 6.0 | 4 | 1 | 0 | 0 | 3 | 7 | 116 | 48 | 68 | 59% | 4-3 | 2.64 | 1.24 |
| 2003-06-15 | Elmer Dessens | R | 31 | W 12-8 | @ MIN | 15 | 103 | - | 4.2 | 10 | 5 | 4 | 0 | 3 | 3 | 93 | 37 | 56 | 60% | 4-4 | 5.36 | 1.62 |
| 2003-06-17 | Andrew Good | R | 24 | L 3-4 | @ HOU | 7 | 7 | - | 5.0 | 5 | 3 | 3 | 2 | 0 | 3 | 71 | 25 | 46 | 65% | 3-1 | 4.21 | 1.26 |
| 2003-06-18 | Brandon Webb | R | 24 | W 2-1 | @ HOU | 9 | 9 | - | 6.0 | 3 | 1 | 1 | 1 | 1 | 5 | 77 | 22 | 55 | 71% | 3-2 | 2.36 | 1.03 |
| 2003-06-19 | Miguel Batista | R | 32 | W 4-2 | @ HOU | 11 | 103 | W | 8.0 | 7 | 2 | 2 | 0 | 1 | 7 | 109 | 36 | 73 | 67% | 5-3 | 2.60 | 1.22 |
| 2003-06-20 | Elmer Dessens | R | 31 | L 6-5 | vs CIN | 16 | 104 | - | 5.0 | 7 | 3 | 3 | 1 | 0 | 4 | 71 | 26 | 45 | 63% | 4-4 | 5.36 | 1.61 |
| 2003-06-21 | John Patterson | R | 25 | L 5-3 | vs CIN | 5 | 10 | W | 7.2 | 7 | 3 | 3 | 0 | 1 | 7 | 103 | 31 | 72 | 70% | 1-3 | 7.00 | 1.70 |
| 2003-06-22 | Andrew Good | R | 24 | L 6-5 | vs CIN | 8 | 8 | - | 5.0 | 6 | 5 | 5 | 0 | 1 | 7 | 81 | 26 | 55 | 68% | 3-1 | 4.67 | 1.27 |
| 2003-06-23 | Brandon Webb | R | 24 | L 7-6 | vs HOU | 10 | 10 | - | 7.0 | 2 | 2 | 2 | 0 | 3 | 2 | 105 | 44 | 61 | 58% | 3-2 | 2.38 | 1.00 |
| 2003-06-24 | Miguel Batista | R | 32 | L 12-5 | vs HOU | 12 | 104 | W | 6.0 | 7 | 4 | 4 | 0 | 3 | 7 | 99 | 36 | 63 | 64% | 6-3 | 2.83 | 1.25 |
| 2003-06-25 | Elmer Dessens | R | 31 | L 3-2 | vs HOU | 17 | 105 | W | 6.2 | 6 | 2 | 2 | 1 | 2 | 4 | 89 | 29 | 60 | 67% | 5-4 | 5.21 | 1.59 |
| 2003-06-27 | John Patterson | R | 25 | W 8-3 | @ DET | 6 | 11 | - | 5.0 | 6 | 3 | 3 | 0 | 2 | 2 | 106 | 40 | 66 | 62% | 1-3 | 6.75 | 1.69 |
| 2003-06-28 | Brandon Webb | R | 24 | W 7-0 | @ DET | 11 | 11 | W | 9.0 | 7 | 0 | 0 | 0 | 1 | 2 | 101 | 34 | 67 | 66% | 4-2 | 2.10 | 0.99 |
| 2003-06-29 | Miguel Batista | R | 32 | W 5-3 | @ DET | 13 | 105 | - | 7.0 | 10 | 3 | 3 | 1 | 1 | 7 | 96 | 30 | 66 | 69% | 6-3 | 2.91 | 1.27 |
| 2003-06-30 | Elmer Dessens | R | 31 | W 8-7 | @ COL | 18 | 106 | - | 5.2 | 5 | 4 | 2 | 1 | 3 | 2 | 112 | 46 | 66 | 59% | 5-4 | 5.08 | 1.57 |
| 2003-07-01 | Andrew Good | R | 24 | L 4-7 | @ COL | 9 | 9 | L | 6.1 | 9 | 5 | 5 | 4 | 1 | 2 | 96 | 30 | 66 | 69% | 3-2 | 4.97 | 1.31 |
| 2003-07-02 | John Patterson | R | 25 | L 2-6 | @ COL | 7 | 12 | L | 6.0 | 7 | 3 | 3 | 0 | 4 | 4 | 98 | 41 | 57 | 58% | 1-4 | 6.39 | 1.71 |
| 2003-07-03 | Brandon Webb | R | 24 | W 8-4 | @ COL | 12 | 12 | W | 7.0 | 8 | 1 | 1 | 0 | 1 | 6 | 103 | 36 | 67 | 65% | 5-2 | 2.04 | 1.01 |
| 2003-07-04 | Miguel Batista | R | 32 | W 3-1 | @ LAN | 14 | 106 | - | 7.0 | 6 | 1 | 1 | 0 | 1 | 7 | 92 | 25 | 67 | 73% | 6-3 | 2.80 | 1.25 |
| 2003-07-05 | Elmer Dessens | R | 31 | L 0-2 | @ LAN | 19 | 107 | L | 7.0 | 5 | 2 | 0 | 0 | 0 | 8 | 93 | 27 | 66 | 71% | 5-5 | 4.75 | 1.52 |
| 2003-07-06 | Andrew Good | R | 24 | W 2-1 | @ LAN | 10 | 10 | W | 6.0 | 4 | 1 | 0 | 0 | 2 | 6 | 82 | 29 | 53 | 65% | 4-2 | 4.50 | 1.28 |
| 2003-07-07 | John Patterson | R | 25 | L 14-6 | vs COL | 8 | 13 | - | 4.0 | 5 | 5 | 5 | 2 | 2 | 2 | 75 | 34 | 41 | 55% | 1-4 | 6.86 | 1.71 |
| 2003-07-08 | Brandon Webb | R | 24 | L 9-3 | vs COL | 13 | 13 | W | 7.0 | 7 | 3 | 3 | 1 | 1 | 9 | 108 | 39 | 69 | 64% | 6-2 | 2.18 | 1.02 |
| 2003-07-09 | Chris Capuano | L | 24 | L 8-3 | vs SDN | 2 | 2 | W | 7.0 | 3 | 1 | 0 | 0 | 0 | 8 | 99 | 31 | 68 | 69% | 1-2 | 5.40 | 1.07 |
| 2003-07-10 | Elmer Dessens | R | 31 | W 2-14 | vs SDN | 20 | 108 | L | 4.1 | 10 | 7 | 7 | 0 | 1 | 2 | 78 | 28 | 50 | 64% | 5-6 | 5.14 | 1.56 |
| 2003-07-11 | Miguel Batista | R | 32 | W 7-10 | vs SFN | 15 | 107 | L | 5.0 | 6 | 5 | 4 | 2 | 2 | 2 | 78 | 32 | 46 | 59% | 6-4 | 3.00 | 1.27 |
| 2003-07-12 | Curt Schilling | R | 37 | W 1-8 | vs SFN | 11 | 325 | L | 6.0 | 6 | 5 | 4 | 2 | 2 | 5 | 94 | 31 | 63 | 67% | 4-4 | 3.27 | 1.01 |
| 2003-07-13 | Brandon Webb | R | 24 | L 7-4 | vs SFN | 14 | 14 | W | 6.0 | 6 | 4 | 4 | 2 | 2 | 8 | 121 | 49 | 72 | 60% | 7-2 | 2.41 | 1.04 |
| 2003-07-17 | Curt Schilling | R | 37 | W 9-1 | @ SDN | 12 | 326 | W | 7.0 | 8 | 1 | 0 | 0 | 1 | 8 | 108 | 30 | 78 | 72% | 5-4 | 3.00 | 1.04 |
| 2003-07-18 | Miguel Batista | R | 32 | W 6-0 | @ SDN | 16 | 108 | W | 9.0 | 5 | 0 | 0 | 0 | 2 | 5 | 93 | 29 | 64 | 69% | 7-4 | 2.77 | 1.23 |
| 2003-07-19 | Brandon Webb | R | 24 | L 0-2 | @ SDN | 15 | 15 | L | 6.0 | 4 | 2 | 2 | 0 | 3 | 8 | 96 | 34 | 62 | 65% | 7-3 | 2.45 | 1.05 |
| 2003-07-20 | Randy Johnson | L | 40 | L 2-3 | @ SDN | 5 | 431 | L | 6.0 | 6 | 2 | 1 | 1 | 2 | 6 | 102 | 34 | 68 | 67% | 1-3 | 5.90 | 1.48 |
| 2003-07-21 | Elmer Dessens | R | 32 | L 4-5 | @ SFN | 21 | 109 | L | 5.2 | 5 | 5 | 5 | 0 | 4 | 6 | 107 | 52 | 55 | 51% | 5-7 | 5.26 | 1.56 |
| 2003-07-22 | Curt Schilling | R | 37 | L 1-3 | @ SFN | 13 | 327 | L | 7.0 | 9 | 3 | 3 | 0 | 1 | 7 | 110 | 40 | 70 | 64% | 5-5 | 3.07 | 1.07 |
| 2003-07-23 | Miguel Batista | R | 32 | L 1-7 | @ SFN | 17 | 109 | L | 5.0 | 3 | 2 | 0 | 0 | 0 | 5 | 98 | 31 | 67 | 68% | 7-5 | 2.66 | 1.20 |
| 2003-07-24 | Brandon Webb | R | 24 | L 2-3 | @ SFN | 16 | 16 | - | 8.0 | 4 | 2 | 2 | 2 | 2 | 8 | 106 | 38 | 68 | 64% | 7-3 | 2.43 | 1.03 |
| 2003-07-25 | Randy Johnson | L | 40 | L 2-1 | vs LAN | 6 | 432 | - | 8.0 | 3 | 1 | 1 | 1 | 1 | 6 | 98 | 29 | 69 | 70% | 1-3 | 4.86 | 1.27 |
| 2003-07-26 | Elmer Dessens | R | 32 | L 1-0 | vs LAN | 22 | 110 | W | 7.0 | 4 | 0 | 0 | 0 | 1 | 6 | 92 | 32 | 60 | 65% | 6-7 | 4.97 | 1.51 |
| 2003-07-27 | Curt Schilling | R | 37 | W 0-1 | vs LAN | 14 | 328 | L | 8.0 | 8 | 1 | 1 | 0 | 0 | 7 | 108 | 33 | 75 | 69% | 5-6 | 2.91 | 1.06 |
| 2003-07-28 | Miguel Batista | R | 32 | L 2-3 | @ FLO | 18 | 110 | L | 7.0 | 7 | 3 | 3 | 1 | 1 | 11 | 106 | 30 | 76 | 72% | 7-6 | 2.72 | 1.20 |
| 2003-07-29 | Brandon Webb | R | 24 | L 1-2 | @ FLO | 17 | 17 | L | 5.0 | 9 | 2 | 2 | 0 | 0 | 5 | 79 | 24 | 55 | 70% | 7-4 | 2.48 | 1.06 |
| 2003-07-30 | Randy Johnson | L | 40 | L 1-3 | @ FLO | 7 | 433 | L | 6.0 | 4 | 2 | 0 | 0 | 2 | 4 | 105 | 36 | 69 | 66% | 1-4 | 4.19 | 1.23 |
| 2003-08-01 | Curt Schilling | R | 37 | L 3-4 | @ CHN | 15 | 329 | - | 6.0 | 4 | 1 | 1 | 0 | 0 | 7 | 72 | 17 | 55 | 76% | 5-6 | 2.83 | 1.04 |
| 2003-08-02 | Miguel Batista | R | 32 | W 4-3 | @ CHN | 19 | 111 | - | 7.0 | 5 | 3 | 3 | 0 | 3 | 2 | 99 | 43 | 56 | 57% | 7-6 | 2.78 | 1.20 |
| 2003-08-03 | Brandon Webb | R | 24 | L 1-2 | @ CHN | 18 | 18 | - | 6.1 | 5 | 1 | 1 | 0 | 5 | 8 | 109 | 48 | 61 | 56% | 7-4 | 2.43 | 1.09 |
| 2003-08-05 | Randy Johnson | L | 40 | L 8-5 | vs MON | 8 | 434 | W | 5.2 | 8 | 5 | 5 | 1 | 3 | 8 | 106 | 33 | 73 | 69% | 2-4 | 4.59 | 1.31 |
| 2003-08-06 | Curt Schilling | R | 37 | L 3-2 | vs MON | 16 | 330 | - | 7.0 | 4 | 2 | 2 | 0 | 2 | 7 | 95 | 31 | 64 | 67% | 5-6 | 2.81 | 1.03 |
| 2003-08-07 | Miguel Batista | R | 32 | L 5-4 | vs MON | 20 | 112 | - | 6.0 | 8 | 4 | 4 | 1 | 0 | 3 | 99 | 40 | 59 | 60% | 7-6 | 2.92 | 1.20 |
| 2003-08-08 | Brandon Webb | R | 24 | W 1-3 | vs NYN | 19 | 19 | L | 6.1 | 3 | 2 | 2 | 0 | 5 | 10 | 111 | 50 | 61 | 55% | 7-5 | 2.44 | 1.09 |
| 2003-08-09 | Elmer Dessens | R | 32 | L 2-1 | vs NYN | 23 | 111 | - | 6.1 | 7 | 1 | 1 | 0 | 2 | 2 | 77 | 27 | 50 | 65% | 6-7 | 4.76 | 1.52 |
| 2003-08-10 | Randy Johnson | L | 40 | L 7-4 | vs NYN | 9 | 435 | W | 8.0 | 10 | 4 | 3 | 1 | 0 | 5 | 99 | 30 | 69 | 70% | 3-4 | 4.42 | 1.30 |
| 2003-08-12 | Curt Schilling | R | 37 | W 2-0 | @ CIN | 17 | 331 | W | 7.0 | 6 | 0 | 0 | 0 | 1 | 11 | 113 | 30 | 83 | 73% | 6-6 | 2.65 | 1.03 |
| 2003-08-13 | Miguel Batista | R | 32 | W 3-1 | @ CIN | 21 | 113 | - | 6.0 | 9 | 1 | 1 | 0 | 2 | 6 | 95 | 33 | 62 | 65% | 7-6 | 2.86 | 1.23 |
| 2003-08-14 | Brandon Webb | R | 24 | L 2-3 | @ CIN | 20 | 20 | L | 5.0 | 6 | 3 | 3 | 0 | 2 | 7 | 93 | 40 | 53 | 57% | 7-6 | 2.55 | 1.11 |
| 2003-08-15 | Randy Johnson | L | 40 | L 4-10 | @ ATL | 10 | 436 | L | 5.0 | 9 | 7 | 7 | 3 | 1 | 7 | 81 | 29 | 52 | 64% | 3-5 | 5.08 | 1.35 |
| 2003-08-16 | Elmer Dessens | R | 32 | L 6-10 | @ ATL | 24 | 112 | - | 4.0 | 8 | 5 | 5 | 1 | 0 | 3 | 75 | 28 | 47 | 63% | 6-7 | 4.95 | 1.54 |
| 2003-08-17 | Curt Schilling | R | 37 | W 2-0 | @ ATL | 18 | 332 | W | 8.0 | 1 | 0 | 0 | 0 | 2 | 12 | 104 | 26 | 78 | 75% | 7-6 | 2.48 | 0.98 |
| 2003-08-18 | Miguel Batista | R | 32 | L 1-6 | @ ATL | 22 | 114 | L | 5.0 | 7 | 5 | 5 | 1 | 2 | 4 | 96 | 34 | 62 | 65% | 7-7 | 3.06 | 1.25 |
| 2003-08-19 | Brandon Webb | R | 24 | L 6-1 | vs CIN | 21 | 21 | W | 7.0 | 4 | 1 | 1 | 0 | 4 | 11 | 111 | 45 | 66 | 59% | 8-6 | 2.49 | 1.11 |
| 2003-08-20 | Randy Johnson | L | 40 | W 0-2 | vs CIN | 11 | 437 | L | 6.0 | 6 | 2 | 2 | 1 | 1 | 6 | 95 | 31 | 64 | 67% | 3-6 | 4.90 | 1.34 |
| 2003-08-21 | Elmer Dessens | R | 32 | L 9-3 | vs CIN | 25 | 113 | W | 5.2 | 3 | 3 | 3 | 1 | 1 | 2 | 80 | 32 | 48 | 60% | 7-7 | 4.93 | 1.50 |
| 2003-08-22 | Curt Schilling | R | 37 | W 1-4 | vs CHN | 19 | 333 | L | 8.0 | 6 | 4 | 4 | 3 | 0 | 14 | 103 | 22 | 81 | 79% | 7-7 | 2.60 | 0.97 |
| 2003-08-23 | Miguel Batista | R | 33 | L 13-2 | vs CHN | 23 | 115 | W | 6.0 | 5 | 2 | 0 | 0 | 4 | 3 | 94 | 36 | 58 | 62% | 8-7 | 2.94 | 1.26 |
| 2003-08-24 | Brandon Webb | R | 24 | W 3-5 | vs CHN | 22 | 22 | - | 3.0 | 3 | 1 | 1 | 0 | 4 | 3 | 66 | 33 | 33 | 50% | 8-6 | 2.50 | 1.14 |
| 2003-08-25 | Randy Johnson | L | 40 | L 11-8 | vs SDN | 12 | 438 | W | 5.0 | 8 | 4 | 4 | 0 | 2 | 4 | 95 | 36 | 59 | 62% | 4-6 | 5.05 | 1.38 |
| 2003-08-26 | Elmer Dessens | R | 32 | W 4-5 | vs SDN | 26 | 114 | - | 7.0 | 6 | 2 | 2 | 1 | 1 | 2 | 110 | 42 | 68 | 62% | 7-7 | 4.82 | 1.48 |
| 2003-08-27 | Curt Schilling | R | 37 | W 2-10 | vs SDN | 20 | 334 | L | 7.0 | 12 | 5 | 5 | 1 | 1 | 6 | 117 | 40 | 77 | 66% | 7-8 | 2.79 | 1.01 |
| 2003-08-29 | Miguel Batista | R | 33 | L 5-4 | vs SFN | 24 | 116 | W | 6.0 | 6 | 3 | 3 | 0 | 2 | 4 | 88 | 35 | 53 | 60% | 9-7 | 3.00 | 1.26 |
| 2003-08-30 | Randy Johnson | L | 40 | W 1-2 | vs SFN | 13 | 439 | L | 7.0 | 5 | 2 | 2 | 2 | 2 | 11 | 98 | 35 | 63 | 64% | 4-7 | 4.84 | 1.35 |
| 2003-08-31 | Brandon Webb | R | 24 | W 1-3 | vs SFN | 23 | 23 | L | 7.0 | 4 | 3 | 3 | 0 | 2 | 11 | 113 | 37 | 76 | 67% | 8-7 | 2.56 | 1.13 |
| 2003-09-01 | Curt Schilling | R | 37 | W 0-2 | vs SFN | 21 | 335 | - | 8.0 | 5 | 0 | 0 | 0 | 0 | 10 | 93 | 27 | 66 | 71% | 7-8 | 2.64 | 0.99 |
| 2003-09-02 | Chris Capuano | L | 24 | L 3-6 | @ SDN | 3 | 3 | L | 3.2 | 9 | 5 | 5 | 1 | 1 | 2 | 75 | 32 | 43 | 57% | 1-3 | 6.63 | 1.37 |
| 2003-09-03 | Miguel Batista | R | 33 | L 0-12 | @ SDN | 25 | 117 | L | 4.0 | 8 | 7 | 7 | 0 | 2 | 7 | 77 | 30 | 47 | 61% | 9-8 | 3.30 | 1.29 |
| 2003-09-04 | Randy Johnson | L | 40 | W 6-5 | @ KCA | 14 | 440 | - | 5.0 | 10 | 4 | 4 | 1 | 2 | 3 | 103 | 38 | 65 | 63% | 4-7 | 4.98 | 1.41 |
| 2003-09-05 | Brandon Webb | R | 24 | W 8-1 | @ SFN | 24 | 24 | W | 7.0 | 3 | 1 | 1 | 0 | 5 | 6 | 106 | 50 | 56 | 53% | 9-7 | 2.51 | 1.13 |
| 2003-09-06 | Curt Schilling | R | 37 | L 4-5 | @ SFN | 22 | 336 | - | 6.0 | 6 | 4 | 4 | 0 | 4 | 8 | 108 | 36 | 72 | 67% | 7-8 | 2.77 | 1.02 |
| 2003-09-07 | Elmer Dessens | R | 32 | W 9-6 | @ SFN | 27 | 115 | - | 3.2 | 9 | 6 | 6 | 0 | 3 | 5 | 83 | 33 | 50 | 60% | 7-7 | 5.03 | 1.52 |
| 2003-09-08 | Miguel Batista | R | 33 | W 3-10 | vs LAN | 26 | 118 | - | 7.0 | 9 | 3 | 3 | 1 | 1 | 7 | 105 | 35 | 70 | 67% | 9-8 | 3.32 | 1.30 |
| 2003-09-09 | Randy Johnson | L | 40 | W 1-4 | vs LAN | 15 | 441 | L | 8.0 | 8 | 4 | 3 | 0 | 3 | 8 | 113 | 36 | 77 | 68% | 4-8 | 4.84 | 1.41 |
| 2003-09-10 | Brandon Webb | R | 24 | L 5-4 | vs LAN | 25 | 25 | - | 7.0 | 6 | 4 | 4 | 0 | 1 | 2 | 107 | 36 | 71 | 66% | 9-7 | 2.62 | 1.12 |
| 2003-09-11 | Chris Capuano | L | 24 | L 2-0 | vs LAN | 4 | 4 | W | 7.0 | 3 | 0 | 0 | 0 | 0 | 4 | 91 | 28 | 63 | 69% | 2-3 | 4.50 | 1.11 |
| 2003-09-12 | Elmer Dessens | R | 32 | W 2-8 | vs COL | 28 | 116 | L | 5.0 | 9 | 5 | 5 | 2 | 0 | 4 | 87 | 31 | 56 | 64% | 7-8 | 5.15 | 1.53 |
| 2003-09-13 | Miguel Batista | R | 33 | L 16-6 | vs COL | 27 | 119 | W | 5.0 | 9 | 6 | 6 | 2 | 4 | 2 | 104 | 45 | 59 | 57% | 10-8 | 3.53 | 1.33 |
| 2003-09-14 | Randy Johnson | L | 40 | L 5-0 | vs COL | 16 | 442 | W | 9.0 | 1 | 0 | 0 | 0 | 1 | 12 | 120 | 32 | 88 | 73% | 5-8 | 4.41 | 1.30 |
| 2003-09-16 | Curt Schilling | R | 37 | W 3-2 | @ LAN | 23 | 337 | W | 7.0 | 8 | 1 | 1 | 0 | 1 | 8 | 101 | 25 | 76 | 75% | 8-8 | 2.71 | 1.03 |
| 2003-09-17 | Brandon Webb | R | 24 | W 2-0 | @ LAN | 26 | 26 | W | 8.0 | 2 | 0 | 0 | 0 | 3 | 5 | 120 | 42 | 78 | 65% | 10-7 | 2.50 | 1.10 |
| 2003-09-18 | Miguel Batista | R | 33 | L 0-2 | @ LAN | 28 | 120 | L | 7.0 | 4 | 1 | 1 | 1 | 1 | 4 | 77 | 29 | 48 | 62% | 10-9 | 3.45 | 1.31 |
| 2003-09-19 | Randy Johnson | L | 40 | W 3-2 | @ MIL | 17 | 443 | - | 6.0 | 10 | 2 | 2 | 1 | 1 | 10 | 104 | 34 | 70 | 67% | 5-8 | 4.33 | 1.33 |
| 2003-09-20 | Elmer Dessens | R | 32 | W 10-4 | @ MIL | 29 | 117 | W | 5.0 | 7 | 2 | 2 | 0 | 2 | 3 | 80 | 33 | 47 | 59% | 8-8 | 5.11 | 1.54 |
| 2003-09-21 | Curt Schilling | R | 37 | L 4-6 | @ MIL | 24 | 338 | L | 5.0 | 8 | 6 | 6 | 3 | 0 | 2 | 65 | 19 | 46 | 71% | 8-9 | 2.95 | 1.05 |
| 2003-09-23 | Brandon Webb | R | 24 | L 9-20 | @ COL | 27 | 27 | L | 4.0 | 7 | 10 | 6 | 1 | 4 | 2 | 106 | 45 | 61 | 58% | 10-8 | 2.75 | 1.14 |
| 2003-09-24 | Randy Johnson | L | 40 | W 6-3 | @ COL | 18 | 444 | W | 6.0 | 7 | 2 | 2 | 1 | 1 | 4 | 109 | 36 | 73 | 67% | 6-8 | 4.26 | 1.33 |
| 2003-09-25 | Miguel Batista | R | 33 | W 8-7 | @ COL | 29 | 121 | - | 5.1 | 6 | 4 | 4 | 0 | 5 | 3 | 93 | 38 | 55 | 59% | 10-9 | 3.54 | 1.33 |
| 2003-09-26 | Elmer Dessens | R | 32 | L 7-6 | vs SLN | 30 | 118 | - | 5.0 | 4 | 2 | 2 | 0 | 2 | 3 | 87 | 35 | 52 | 60% | 8-8 | 5.06 | 1.53 |
| 2003-09-27 | Chris Capuano | L | 24 | W 2-3 | vs SLN | 5 | 5 | L | 4.1 | 4 | 3 | 3 | 1 | 3 | 5 | 81 | 33 | 48 | 59% | 2-4 | 4.64 | 1.15 |
| 2003-09-28 | Brandon Webb | R | 24 | W 5-9 | vs SLN | 28 | 28 | L | 4.0 | 5 | 6 | 3 | 1 | 2 | 5 | 80 | 30 | 50 | 63% | 10-9 | 2.83 | 1.15 |