About ERA

Earned run average (ERA) is a metric that shows how many earned runs on average, a pitcher or team's pitcher, gives up over the course of nine innings. It is calculated by dividing earned runs by innings pitched then multiplying the result by 9. Generally, for ERA, lower is better. (Source)

Top Washington Nationals Players by ERA

Which Washington Nationals players rank highest in ERA? Below are the top ten by single season and by career totals with the team, requiring at least 50 innings pitched for a season record, or 100 innings pitched for a career record with the team.
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Washington Nationals ERA Per Season

Washington Nationals's ERA for each season of their history, plotted alongside yearly averages for MLB, the Unknown, and the Unknown.
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Washington Nationals ERA Season Distribution vs. MLB and Peers

Each box summarizes ERA across all seasons, comparing the Washington Nationals to MLB as a whole, the Unknown, and the Unknown. The box covers the middle 50% of seasons, the center line is the median, and the whiskers extend to the min and max values.
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Washington Nationals ERA Year-Over-Year Change

A waterfall chart showing how the Washington Nationals's ERA shifted season over season. Each bar represents the change from the previous year, making it easy to spot peak and decline phases.
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Washington Nationals ERA — Season-by-Season Breakdown

Every season of Washington Nationals's history with ERA alongside yearly averages for MLB, the Unknown, and the Unknown. Career totals include sum, average, minimum, maximum, and median.
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