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The last two years, the Twins' bullpen has been incredibly stable. They've also been regarded as quite effective, especially when compared to the starting rotation. During the last leg of the season, the bullpen was neither effective nor efficient. I'm going to discuss the players who were on the club for most of the season.Six pitchers spent all season with the Twins and threw almost all of their innings in the bullpen: Swarzak, Burton, Fien, Duensing, Thielbar and Perkins. They all threw between 47 and 68 innings, with Swarzak again logging the most frames and Thielbar the least. With so many measures to view overall effectiveness, it is really hard to summarize the group, other than to point out that five of these six relievers gave up more hits than innings pitched. Only Glen Perkins struck out more than one batter per inning and all of their ERAs were over three. As a relief staff, the Twins didn't strike out many, but also didn't walk many. This wasn't a bullpen that overpowered hitters. As a group they were effective when they hit their spots and the balls hit into play found the gloves of the Twins fielders. Here's a brief thumbnail of each along with a projection for 2015: Thielbar: After having a fine rookie campaign, Caleb Thielbar pitched a pretty anonymous 47.1 innings. He was close to equally effective against left or right. Like most Twins relievers, he weakened at the end of the season. Thielbar is not eligible for arbitration, which increases his value. I expect that Caleb will be a member of the coming year's bullpen. Duensing: The WHIP is up, K's are down. Duensing was the only all-season reliever to have his ERA outpace his FIP by a substantial amount. I have liked Duensing because of his versatility and durability, but since he will be arb-eligible, he is a strong candidate to be non-tendered. I, for one, hope that the Twins find a way to keep the veteran lefty, but I wouldn't be at all surprised if he is traded or non-tendered. Perkins: Publicly, the Twins are saying that Perkins is an All-Star closer and that his pitching arm is fine. While I am glad that there isn't something seriously wrong with his arm, I'm not convinced that his performance going forward won't become an issue. Perkins got his swings and misses and his strikeouts in 2014, but even before his dismal September, his velocity was down and he allowed a lot of hard-hit balls, not all of which should have been caught. He allowed 32 hits in 32 innings from June-August before his (injury-fueled) drop-off in September. Just about every stat went the wrong way in 2014. At the very least, Perk will have to make some adjustments. Swarzak: He won points with his manager and pitching coach by taking the ball when asked. In 2015 however he wil have a different coach and manager. Swarzak's role is long relief and they just aren't very valuable unless they can evolve into a late-inning role or a spot in the rotation. It looks to me like long relief is Swarzak's only role. Swarzak garnered four starts, with mostly unimpressive results and wasn't much better in higher leverage situations. The numbers say he regressed to the mean after a very good 2013. His WHIP was up, walks up and strikeouts down. Since he's arbitration-eligible and out of options, I expect Swarzak will be pitching for someone else next year. Burton: Burton was a solid performer in 2012, less solid in 2013, and started out horribly in 2014. He pitched better as the season wore on, and by the end of the season he was the Twins most reliable reliever IMHO. The warning signs started in 2013. His velocity was down, and it lessened the effectiveness of his out pitch, the change-up. The numbers point the wrong way--WHIP, hits per IP and BBs up, K's down. Burton was victimized by base stealers, unable or unwilling to keep runners close. The Twins pretty much closed the door on his return by buying out his 2015 option. The 33 year old Burton will be a free agent and I doubt the Twins will seriously try to re-sign him. Fien: Like Burton and Thielbar, Fien was picked off the scrap heap. His performance when called up in 2012 was excellent and surprising. He started strong in 2013, but faded. That script was followed in 2014. Fien was the principal eighth inning guy and did well holding leads. In his few attempts to close games, he couldn't get it done. Fien's two-pitch mix requires excellent command. If he's a little off, the ball can travel a long, long way. He allowed slightly more hits than innings pitched, struck out far fewer batters than previously and yielded some big innings. At 31, it is doubtful that he can improve much. Much like Swarzak, Duensing and Burton, it seems likely that we've seen the best these men have to offer. It makes sense to move several of the bullpen guys and replace them with younger guys with power arms. This concludes my "Postseason Reviews". To summarize, there are a lot of pretty good players already in the majors. The talent needs to be augmented by an improved pitching staff and maybe some premium talent that is getting close to arriving. Click here to view the article