Matt Lindstrom has allowed an earned run in three of his last five relief appearances.
The streaky Idahoan didn't allow a run through April 20, then gave up six in his next four appearances, then was perfect in May until the 10th, when his newest batch of concerns cropped up. The 32-year-old reliever, signed to a one-year, $2.8 million contract over the winter, holds a 4.76 ERA over 17 innings. Lindstrom will continue operating out of a middle relief role.
Pat Neshek owns a 2.81 ERA over 18 appearances.
Born and bred in Minnesota, Neshek has been a decent middle reliever since he was unceremoniously waived by the Twins prior to the 2011 season. Over the last two seasons in Oakland, he's posted a 2.02 ERA, 1.15 WHIP and 27/14 K/BB ratio over 42 appearances.
Jonathan Herrera is batting .283/.327/.370 through 49 plate appearances.
If his slash numbers hold, Herrera will finish with the best offensive season of his career, topping the .694 OPS he mustered in 2010. Unfortunately, the utility infielder has scuffled in the field recently, recording three errors in his last 12 games.
Wesley Wright holds a 2.95 ERA over 21 appearances.
Wright broke out in 2012, putting up a 3.27 ERA while striking out over a batter per inning. Over his first three seasons, batters teed off to the tune of a 5.33 ERA and 1.55 WHIP over 134 games. In the last three years, Wright has turned into a fine LOOGY, posting a 2.94 ERA and 8.4/2.9 K/BB/9 rate. Owners in deep AL-only formats should note that Wright's WHIP this year (1.53) sits right around where it did during the dark years of his career. He's walking fewer batters then he ever has, but has surrendered 23 hits over 18 1/3 frames.
George Kottaras has just two hits this season.
Kottaras has started only four games this season and hasn't registered a hit since April 28. He's batting .125/.364/.375 this season, somehow drawing six walks in 21 plate appearances despite his limp bat.
Rex Brothers hasn't allowed a run since April 6.
And that run, surrendered to the Padres, is the only blemish on his campaign to this point. Brothers has six holds, a 0.47 ERA, 1.14 WHIP and 20/7 K/BB ratio over 21 appearances. He's been Colorado's best reliever, but closer Rafael Betancourt is also pitching well for the 24-21 Rockies. Brothers could be Colorado's full-time closer next season, but he likely won't earn saves in 2013 barring injury.
Craig Stammen was knocked around the park by the Giants Monday, allowing two runs on seven hits over 2 2/3 innings.
Washington didn't have much of a chance after Zach Duke spotted the Giants an early lead, but Stammen's poor performance sealed their fate. Stammen stranded a handful of runners to limit the damage this game had on his ERA, which jumped from 2.25 to 2.78. As a long reliever, Stammen has fulfilled expectations, adding a 1.19 WHIP and 23/5 K/BB rate over 22 2/3 innings.
Pedro Strop was slapped with a loss Monday against the Yankees after allowing two runs over two-thirds of an inning.
Called upon to begin the 10th inning, Strop gave up consecutive doubles to Ichiro Suzuki and Vernon Wells before recording a pair of outs. He was asked to intentionally walk Robinson Cano before the O's tabbed Brian Matusz, who allowed an inherited runner to score. Strop's stuff is absolutely lethal, but his post-WBC efforts haven't impressed. The 27-year-old holds a 5.19 ERA and 1.44 WHIP over 21 appearances. He's got closer's stuff, but is nowhere close to being trusted in the ninth inning.