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It's no coincidence that the Yankees have had both Mariano Rivera and a consistently strong bullpen for the last 18 seasons. When you've got the G.O.A.T. out there closing down the 9th inning, that makes the rest of the 'pen much easier to construct. The Yankees have excelled at constructing strong support staffs in front of Mo in his time as closer, through free agency and their own farm system, and with Mo finally deciding to show mercy on the rest of baseball and retire after the 2013 season, that support staff was going to be put to the test as part of a transitional period to a new era of Yankee relief pitching.
As usual, the Yankee 'pen wasn't short on depth in 2013. In fact, they had more viable options than available spots near the end of Spring Training. What it didn't have was the strong depth of talent that it usually does and the end result for the group in Mo's final season was a step down from what we've come to expect.