Javier Lopez career ERA
3.48Career Regular Season
Javier Lopez has a career ERA of 3.48 over 14 regular seasons.
- Best season on file: 1.60 in 2015.
- Most recent: 4.05 in 2016.
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. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 2003 |  COL | 75 | 4 | 1 | 3.70 | 58.1 | 40 | 12 | 1.20 | 1 |
| 2004 | COL | 64 | 1 | 2 | 7.52 | 40.2 | 20 | 26 | 1.75 | 0 |
| 2005 |  COL/ARI | 32 | 1 | 1 | 11.02 | 16.1 | 12 | 11 | 2.27 | 2 |
| 2006 |  BOS | 27 | 1 | 0 | 2.70 | 16.2 | 11 | 10 | 1.38 | 1 |
| 2007 | BOS | 61 | 2 | 1 | 3.10 | 40.2 | 26 | 18 | 1.33 | 0 |
| 2008 | BOS | 70 | 2 | 0 | 2.43 | 59.1 | 38 | 27 | 1.35 | 0 |
| 2009 | BOS | 14 | 0 | 2 | 9.26 | 11.2 | 5 | 9 | 2.49 | 0 |
| 2010 |  PIT/SF | 77 | 4 | 2 | 2.34 | 57.2 | 38 | 20 | 1.21 | 0 |
| 2011 | SF | 70 | 5 | 2 | 2.72 | 53.0 | 40 | 26 | 1.28 | 1 |
| 2012 | SF | 70 | 3 | 0 | 2.50 | 36.0 | 28 | 14 | 1.42 | 7 |
| 2013 | SF | 69 | 4 | 2 | 1.83 | 39.1 | 37 | 12 | 1.07 | 1 |
| 2014 | SF | 65 | 1 | 1 | 3.11 | 37.2 | 22 | 19 | 1.33 | 0 |
| 2015 | SF | 77 | 1 | 0 | 1.60 | 39.1 | 26 | 16 | 0.89 | 0 |
| 2016 | SF | 68 | 1 | 3 | 4.05 | 26.2 | 15 | 15 | 1.46 | 1 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV