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The New York Yankees already have the greatest closer of all time in their history books. Mariano Rivera, the only unanimous hall of famer in baseball history, revolutionized the closer position. Rivera earned an astonishing 652 saves and had an incredible 2.21 ERA during his regular season career. Not too mention the incredible history he had in the postseason. The Yankees have been very fortunate when it comes to guys who have manned the closer position. Once Mariano retired, the Yankees transitioned to David Robertson. After David Robertson, the Yankees had Andrew Miller.