Dan Haren had a 3-7 record with an ERA of 5.08 and 43 strikeouts in 14 appearances in his rookie season in 2003.
Games
| NAME | DATE | SEASON | TM | OPP | DEC | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | D. Haren | 9/14/2003 | 2003 |  STL | @ |  HOU | L | 1 | 9.82 | 2 | 0 | 0 | 0 | 3.2 | 5 | 4 | 4 | 0 | 1 | 2 | 0 | 0 | 19 | 0 |
| 2 | | D. Haren | 9/9/2003 | 2003 | STL | vs |  COL | L | 1 | 12.00 | 1 | 0 | 0 | 0 | 3.0 | 3 | 4 | 4 | 2 | 1 | 0 | 0 | 0 | 13 | 0 |
| 3 | | D. Haren | 9/3/2003 | 2003 | STL | @ |  CHC | 1 | 3.60 | 1 | 0 | 0 | 0 | 5.0 | 6 | 2 | 2 | 0 | 1 | 1 | 0 | 0 | 22 | 0 | |
| 4 | | D. Haren | 8/29/2003 | 2003 | STL | @ |  CIN | L | 1 | 9.53 | 4 | 0 | 0 | 0 | 5.2 | 6 | 6 | 6 | 1 | 3 | 1 | 0 | 0 | 26 | 0 |
| 5 | | D. Haren | 8/24/2003 | 2003 | STL | vs |  PHI | ||||||||||||||||||
| 6 | | D. Haren | 8/22/2003 | 2003 | STL | vs | PHI | 1 | 3.00 | 3 | 0 | 0 | 0 | 6.0 | 5 | 2 | 2 | 1 | 1 | 0 | 0 | 0 | 23 | 0 | |
| 7 | | D. Haren | 8/16/2003 | 2003 | STL | @ | PHI | L | 1 | 7.50 | 5 | 0 | 0 | 0 | 6.0 | 7 | 5 | 5 | 2 | 1 | 0 | 0 | 0 | 25 | 0 |
| 8 | | D. Haren | 8/11/2003 | 2003 | STL | @ |  PIT | W | 1 | 1.69 | 0 | 0 | 0 | 0 | 5.1 | 10 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 26 | 1 |
| 9 | | D. Haren | 8/6/2003 | 2003 | STL | vs |  FLA | L | 1 | 7.50 | 6 | 0 | 0 | 0 | 6.0 | 10 | 5 | 5 | 1 | 1 | 0 | 0 | 0 | 28 | 0 |
| 10 | | D. Haren | 7/30/2003 | 2003 | STL | @ |  MON | W | 1 | 0.00 | 3 | 0 | 0 | 0 | 7.0 | 4 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 25 | 0 |
| 11 | | D. Haren | 7/25/2003 | 2003 | STL | vs | PIT | 1 | 5.06 | 6 | 0 | 0 | 0 | 5.1 | 4 | 3 | 3 | 0 | 4 | 0 | 0 | 0 | 24 | 1 | |
| 12 | | D. Haren | 7/19/2003 | 2003 | STL | @ |  LAD | W | 1 | 1.50 | 3 | 0 | 0 | 0 | 6.0 | 6 | 1 | 1 | 1 | 2 | 0 | 0 | 0 | 25 | 0 |
| 13 | | D. Haren | 7/13/2003 | 2003 | STL | vs |  SDP | 1 | 1.50 | 5 | 0 | 0 | 0 | 6.0 | 6 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 22 | 0 | |
| 14 | | D. Haren | 7/8/2003 | 2003 | STL | @ |  SFG | L | 1 | 27.00 | 1 | 0 | 0 | 0 | 1.2 | 5 | 5 | 6 | 1 | 2 | 0 | 0 | 0 | 14 | 1 |
| 15 | | D. Haren | 6/30/2003 | 2003 | STL | vs | SFG | L | 1 | 3.00 | 3 | 0 | 0 | 0 | 6.0 | 7 | 2 | 4 | 0 | 1 | 0 | 0 | 0 | 28 | 0 |
| Total | 14 | 5.08 | 43 | 0 | 0 | 0 | 72.2 | 84 | 41 | 44 | 9 | 22 | 5 | 0 | 0 | 320 | 3 |
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