Mariano Rivera has the best career postseason ERA wit 0.74 in 133.1 innings pitched.
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Through the 2011 season, Mariano Rivera has a career ERA of 2.21. He also has a career postseason ERA of 0.70.
That was Bob Gibson, whose 1.12 ERA remains the lowest for any starting pitcher since Dutch Leonard in 1914, and the fourth-lowest of all time, dating back to 1876. In that year Gibson pitched 13 shutouts -- since 1998, no MLB starting pitcher has had 13 complete games!
Andy Pettitte has a record of 18 wins, 9 losses and an ERA of 3.90
Babe Ruth, pitching for the Boston Red Sox had the best ERA in 1916. It was 1.75. That's a low ERA for people not familiar with the game.
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