Alex Trautwig/Getty Images
Sori has done an incredible job filling in for Mariano Rivera this season and his numbers prove it. The Yankees' closer for 2012 has racked up 42 saves while pitching to an ERA of 2.10.
Dependability has also been a plus, as Sori has only blown four saves.
Robertson has had another solid year as the team's setup man and he will continue that job in the 2012 postseason.
At 2.84, Robertson's ERA is a full run and a half higher than it was in 2011, but is still very respectable. D-Rob has always had a great knack for getting himself out of pressure-packed situations and he'll need that unique skill pitching in October.
Rapada should be Girardi's go-to left-hander out of the bullpen and he's earned his role over Boone Logan.
The left-hander is the king of fractional innings and Rapada's ERA (2.87) is superior to Logan's (3.69).
Phelps has seen his fair share of time in the starting rotation and bullpen this season, but when looking at his bullpen numbers, there's no doubt the rookie has been successful in that role.
In 21 appearances out of the 'pen, Phelps is pitching to a 2.43 ERA with 31 hits allowed and 41 strikeouts in 40.2 innings pitched.
Upon coming off the DL this season, it was thought Joba Chamberlain would give the Yankees' bullpen a boost after it was shortened by the injury to Rivera.
But he's done exactly the opposite and has done everything in his power to sabotage his chances of being a key arm in the Yanks' bullpen in the postseason.