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Let’s see if we can put Mariano Rivera’s postseason work in proper context with a few numbers. He has appeared in 96 postseason games. He pitched 141 innings. His ERA is 0.70. Yes, that’s a zero in front of the decimal point. It is, of course, the best postseason ERA for anyone who has thrown 40 innings. Sandy Koufax, at 0.95, is next.