Mark Prior ERA in 2004
4.022004 Regular Season
Mark Prior posted a 4.02 ERA in the 2004 regular season.
| ERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent. | IP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs. | H: Times the batter reached base by hitting the ball, without help from an error. | R: Runs — scored by the batter, or allowed by the pitcher. | ER: Earned runs allowed — runs that scored without help from an error. | BB: Times the batter reached first base on four balls. | K: Batters this pitcher struck out. | HR: Home runs hit. | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 30, 2004 |  vs CIN | L 2-1 F/12 | 4.02 | 9.0 | 3 | 1 | 1 | 1 | 16 | 1 |
| Sep 25, 2004 |  @ NYM | L 4-3 F/11 | 4.27 | 7.2 | 4 | 0 | 0 | 2 | 5 | 0 |
| Sep 20, 2004 |  @ MIA | W 5-1 | 4.59 | 7.2 | 5 | 1 | 1 | 1 | 9 | 0 |
| Sep 15, 2004 |  vs PIT | W 13-5 | 4.87 | 5.0 | 9 | 5 | 5 | 3 | 5 | 0 |
| Sep 10, 2004 | vs MIA | W 11-2 | 4.63 | 8.0 | 9 | 2 | 2 | 0 | 8 | 0 |
| Aug 31, 2004 |  @ WSH | L 8-0 | 4.87 | 5.0 | 6 | 5 | 5 | 4 | 8 | 2 |
| Aug 26, 2004 |  vs HOU | W 8-3 | 4.60 | 6.0 | 7 | 2 | 2 | 3 | 8 | 1 |
| Aug 21, 2004 | @ HOU | L 4-3 | 4.73 | 7.0 | 4 | 2 | 2 | 5 | 6 | 0 |
| Aug 15, 2004 |  vs LAD | L 8-5 | 4.97 | 6.1 | 8 | 3 | 3 | 2 | 9 | 2 |
| Aug 10, 2004 |  vs SD | L 8-6 | 5.05 | 3.0 | 8 | 7 | 7 | 5 | 3 | 0 |
| Aug 5, 2004 |  @ COL | W 5-1 | 4.17 | 6.0 | 6 | 0 | 0 | 2 | 8 | 0 |
| Jul 30, 2004 |  vs PHI | W 10-7 | 4.69 | 4.1 | 8 | 6 | 6 | 2 | 5 | 4 |
| Jul 25, 2004 | @ PHI | L 3-2 | 3.92 | 6.0 | 5 | 2 | 2 | 0 | 8 | 1 |
| Jul 15, 2004 |  vs MIL | W 4-1 | 4.06 | 1.2 | 1 | 1 | 1 | 2 | 1 | 0 |
| Jul 6, 2004 | @ MIL | L 4-2 | 4.00 | 4.0 | 4 | 4 | 4 | 3 | 8 | 1 |
| Jul 1, 2004 | vs HOU | W 5-4 F/10 | 3.38 | 7.1 | 5 | 3 | 3 | 3 | 4 | 1 |
| Jun 25, 2004 |  @ CHW | W 7-4 | 3.28 | 5.0 | 2 | 1 | 1 | 3 | 6 | 0 |
| Jun 19, 2004 |  vs ATH | W 4-3 | 3.66 | 5.0 | 6 | 3 | 3 | 1 | 5 | 0 |
| Jun 14, 2004 | @ HOU | W 7-2 | 3.07 | 5.0 | 5 | 0 | 0 | 1 | 8 | 0 |
| Jun 9, 2004 |  vs STL | L 12-4 | 4.66 | 3.2 | 5 | 5 | 5 | 5 | 1 | 1 |
| Jun 4, 2004 | vs PIT | L 2-1 | 0.00 | 6.0 | 2 | 0 | 0 | 0 | 8 | 0 |
- 4th-best of Mark Prior's 5 seasons on file; the best is 2.43 in 2003.
- Up 1.59 from 2.43 in 2003.
Figures come from ESPN's box scores and were last read on October 29, 2026.