How Kenley Jansen's ERA Compares to Similar Players
Kenley Jansen has posted a career ERA of 2.57, well below the relief pitcher average of 3.96 — a mark that ranks among the best of his generation. His strongest ERA season came in 2010, posting .670, well below the relief pitcher average of 3.9 that year. The highest point came in 2019 at 3.71, below the relief pitcher average of 4.45 that year. The ERA has trended upward over recent seasons. The figure has moved from 3.63 in 2023 to 3.29 in 2024 and 2.59 in 2025. The upward arc suggests continued forward momentum heading into 2026. Significant season-to-season variance characterizes the ERA profile — ranging from .670 to 3.71 — though the career average has remained well above league norms.
Kenley Jansen Lifetime ERA and Similar Stats
Stats similar to ERA for Kenley Jansen
| Kenley Jansen
ERA | Kenley Jansen
Component ERA | Kenley Jansen
Defense Independent ERA |
|---|
| Career | 2.57 | 2.03 | 2.49 |
| Season Avg. | 2.57 | 2.03 | 2.49 |
| 162 Game Avg. | 2.57 | 2.03 | 2.49 |
| More Info | See More | See More | See More |
Kenley Jansen ERA Per Season
Kenley Jansen's ERA for each season of his MLB career, plotted against that year's league average. Switch between comparisons — American League, Hall of Fame, RP, Carribean, or players born in the same country — to see how he stacked up year by year.
Kenley Jansen ERA by Team
Kenley Jansen's career ERA totals broken down by each team he played for, ordered by when he first joined that team.
Kenley Jansen ERA Year-Over-Year Change
A waterfall chart tracking how Kenley Jansen's career ERA shifted from season to season. Each bar represents the change added to his career total that year, making peak and decline phases easy to spot.
Kenley Jansen ERA Distribution vs. Comparable Players
Each box summarizes Kenley Jansen's seasonal ERA alongside a selected comparison group across all seasons he played. The box covers the middle 50% of seasons, the center line is the median, and the whiskers extend to the min and max. A tighter box means more consistency; a higher median means more output. Use the selector to switch comparison groups.
Kenley Jansen ERA — Season-by-Season Breakdown
Every season of Kenley Jansen's MLB career with ERA alongside league, Hall of Fame, positional, birth region, and country-of-birth averages for that year. Career totals include sum, average, min, max, and median.
Note: A dash (—) means no qualifying players existed in that comparison group for that season. Most commonly this happens for the Hall of Fame group.
