Clayton Mortensen career ERA
4.68Career Regular Season
Clayton Mortensen has a career ERA of 4.68 over 5 regular seasons.
- Best season on file: 3.21 in 2012.
- Most recent: 5.34 in 2013.
Average of 5 regular seasons, 2009 through 2013. Figures come from ESPN's box scores and were last read on September 23, 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. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 2009 |  STL/ATH | 7 | 2 | 4 | 7.63 | 30.2 | 13 | 13 | 1.79 | 0 |
| 2010 | ATH | 1 | 0 | 0 | 4.50 | 6.0 | 7 | 2 | 1.33 | 0 |
| 2011 |  COL | 16 | 2 | 4 | 3.86 | 58.1 | 30 | 24 | 1.35 | 0 |
| 2012 |  BOS | 26 | 1 | 1 | 3.21 | 42.0 | 41 | 19 | 1.21 | 0 |
| 2013 | BOS | 24 | 1 | 2 | 5.34 | 30.1 | 21 | 16 | 1.58 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV