Hisashi Iwakuma career ERA
3.42Career Regular Season
Hisashi Iwakuma has a career ERA of 3.42 over 6 regular seasons.
- Best season on file: 2.66 in 2013.
- Most recent: 4.35 in 2017.
Average of 6 regular seasons, 2012 through 2017. 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. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| 2012 |  SEA | 30 | 9 | 5 | 3.16 | 125.1 | 101 | 43 | 1.28 | 2 |
| 2013 | SEA | 33 | 14 | 6 | 2.66 | 219.2 | 185 | 42 | 1.01 | 0 |
| 2014 | SEA | 28 | 15 | 9 | 3.52 | 179.0 | 154 | 21 | 1.05 | 0 |
| 2015 | SEA | 20 | 9 | 5 | 3.54 | 129.2 | 111 | 21 | 1.06 | 0 |
| 2016 | SEA | 33 | 16 | 12 | 4.12 | 199.0 | 147 | 46 | 1.33 | 0 |
| 2017 | SEA | 6 | 0 | 2 | 4.35 | 31.0 | 16 | 12 | 1.26 | 0 |
What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV