Mark Leiter career ERA
4.57Career Regular Season
Mark Leiter has a career ERA of 4.57 over 11 regular seasons.
| GP: Games the player appeared in, however briefly. | W: Games in which this pitcher was credited with the win. | L: Games in which this pitcher was charged with the loss. | 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. | K: Batters this pitcher struck out. | BB: Times the batter reached first base on four balls. | WHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite. | SV: Games finished by protecting a narrow lead to the last out. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 1990 |  NYY | 8 | 1 | 1 | 6.84 | 26.1 | 21 | 9 | 1.59 | 0 |
| 1991 |  DET | 38 | 9 | 7 | 4.21 | 134.2 | 103 | 50 | 1.30 | 1 |
| 1992 | DET | 35 | 8 | 5 | 4.18 | 112.0 | 75 | 43 | 1.42 | 0 |
| 1993 | DET | 27 | 6 | 6 | 4.73 | 106.2 | 70 | 44 | 1.45 | 0 |
| 1994 |  LAA | 40 | 4 | 7 | 4.72 | 95.1 | 71 | 35 | 1.41 | 2 |
| 1995 |  SF | 30 | 10 | 12 | 3.82 | 195.2 | 129 | 55 | 1.23 | 0 |
| 1996 |  SF/WSH | 35 | 8 | 12 | 4.92 | 205.0 | 164 | 69 | 1.40 | 0 |
| 1997 |  PHI | 31 | 10 | 17 | 5.67 | 182.2 | 148 | 64 | 1.53 | 0 |
| 1998 | PHI | 69 | 7 | 5 | 3.55 | 88.2 | 84 | 47 | 1.29 | 23 |
| 1999 |  SEA | 2 | 0 | 0 | 6.75 | 1.1 | 1 | 0 | 1.50 | 0 |
| 2001 |  MIL | 20 | 2 | 1 | 3.75 | 36.0 | 26 | 8 | 1.11 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV
- Best season on file: 3.55 in 1998.
- Most recent: 3.75 in 2001.
Average of 11 regular seasons, 1990 through 2001. Figures come from ESPN's box scores and were last read on November 3, 2026.