Jeff Karstens ERA in 2012
3.972012 Regular Season
Jeff Karstens posted a 3.97 ERA in the 2012 regular season.
- 3rd-best of Jeff Karstens' 7 seasons on file; the best is 3.38 in 2011.
- Up 0.59 from 3.38 in 2011.
Figures come from ESPN's box scores and were last read on September 22, 2026.
| 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. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 2006 |  NYY | 8 | 2 | 1 | 3.80 | 42.2 | 16 | 11 | 1.20 | 0 |
| 2007 | NYY | 7 | 1 | 4 | 11.05 | 14.2 | 5 | 9 | 2.45 | 0 |
| 2008 |  PIT | 9 | 2 | 6 | 4.03 | 51.1 | 23 | 13 | 1.34 | 0 |
| 2009 | PIT | 39 | 4 | 6 | 5.42 | 108.0 | 52 | 45 | 1.48 | 0 |
| 2010 | PIT | 26 | 3 | 10 | 4.92 | 122.2 | 72 | 27 | 1.41 | 0 |
| 2011 | PIT | 30 | 9 | 9 | 3.38 | 162.1 | 96 | 33 | 1.21 | 0 |
| 2012 | PIT | 19 | 5 | 4 | 3.97 | 90.2 | 66 | 15 | 1.15 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV