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David Robertson appears to be the heir to Mariano Rivera's throne.
How do you replace the greatest player in the history of his position? How can you possibly ask someone to fill those large shoes?
The Yankees are forced to answer those questions in 2014.
Mariano Rivera completed the greatest career any relief pitcher has ever had in 2013, and he did it in style by posting 44 saves with a 2.11 ERA. Not bad for a 43-year-old.
It would only make sense that the man who has been holding down the eighth innings for Rivera would step into the closer role for 2014.
David Robertson has been the Bombers' setup man since 2011, and he has had an occasional "taste" of the closer role when Rivera has either been unavailable or injured (as he was in 2012).
The results have been mixed.
The table below shows Robertson's ERA and WHIP when pitching in the eighth or ninth innings (since 2011).
Statistics courtesy of MLB.com.
The sample size for the ninth inning is small (a little over 25 innings pitched), but nonetheless shows a distinct difference in performance.
Regardless, the 28-year-old has earned the right to take the mound as the Yankees' closer in 2014. He owns a deceptive low-to-mid-90s fastball and a decent curveball.
No one will ever duplicate what Rivera was able to accomplish, so Yankees fans will need to refrain from holding Robertson to the standards set over the past 17 seasons.
For the first time in nearly two decades, the team will need to have a Plan B for ninth-inning save situations. If Robertson should prove to be better suited as a setup man, who do the Yankees call upon to close out games?
Dellin Betances has shown promise as a reliever, but would he be ready to jump into a closing situation? Last season was his first as a relief pitcher in the organization.
Is it worth re-signing either Phil Hughes or Joba Chamberlain as insurance, or at the very least for depth?
Left-handed specialist Boone Logan is also a free agent. He has been used frequently over the past two seasons by Joe Girardi. In 2012, he led the league in appearances with 80, and he has appeared in 205 games since 2011. As a 29-year-old, Logan is in his peak years and may be worth bringing back.
Next to starting pitching, the Yankees' relief corps has the most questions to be answered this offseason.