Yankees' playoff bullpen has the potential to be dominant

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Andy Pettitte’s health and Phil Hughes’ second-half struggles give the Yankees’ rotation some major question marks after CC Sabathia, but New York’s bullpen may actually be underrated at this point.
Mariano Rivera’s late-season rough patch provides a bit of worry that he’ll be something less than his usual unhittable self, but I’m not counting on it. He’s both the greatest closer of all time and the greatest postseason pitcher of all time, finished his age-40 season with a 1.80 ERA, .183 opponents’ batting average, and 45/11 K/BB ratio in 60 innings, and becomes an even bigger weapon in the playoffs when multi-inning appearances are common.
Rivera looms as the ever present late-game hammer and his setup trio of Joba Chamberlain, Kerry Wood, and David Robertson is better than most people think. Chamberlain has a 74/22 K/BB ratio and just five homers allowed in 71 innings, which is good for a 3.41 xFIP that ranks eighth in the AL. Wood struggles with his control, but has been untouchable since the Yankees acquired him from the Indians on July 31, posting a 0.69 ERA and 31 strikeouts in 26 innings.
Robertson is the least-known of the bunch, but has a 3.44 ERA and 3.51 xFIP in 105 innings over the past two years, with his 11.44 strikeouts per nine innings leading the league during that time. In terms of top-to-bottom bullpen depth the Twins perhaps have an advantage, but teams can typically rely on just three or four relievers in the playoffs and New York’s foursome of Rivera, Chamberlain, Wood, and Robertson is as good and overpowering as any in baseball.