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Earned Run Average per 9 innings It shows for every nine innings a pitcher pitches how many runs he has averaged to gived up. This does not include unearned runs (ie runs given up because of errors). Caluclation (Earned Runs/number of innings pitched)*9 innings
That's the pitcher's Earned Run Average, i. e., the number of earned runs the pitcher allows per nine inning. To arrive at the ERA, take the number of earned runs, multiply by 9 and divide by the number of innings pitched.
The era in which baseball has become a lot more challenging to teams to win a pennant (World Series). I'm not sure but it can also mean the era in which baseball has been more technological, in terms of keeping statistics, comparing players ballclubs. Also, when almost every pitcher throws faster than 90 miles per hours.