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Luis Avilan: Despite injuries to the bullpen, Avilan's impressive pitching has helped maintain the league's top bullpen. The left-hander has a 1.69 ERA and 12 holds in 32 innings this season. I think Avilan will see a slightly reduced role in the second half of the season. The Braves will likely add depth to the bullpen at the trade deadline, which will allow Avilan to work more in situational roles to help limit his innings. Still, Avilan features excellent stuff and will excel in any role he is asked to carry out.
*Luis Ayala: The right-hander was placed on the disabled list on April 30 with an anxiety disorder and is currently pitching for Triple-A Gwinnett. It will be interesting to see if he makes it back to Atlanta in 2013, as he could be a valuable pitcher for the team. It will likely depend on the health of the rest of the bullpen if he pitches in Atlanta.
David Carpenter: Carpenter features a lively arm but not a lot of movement and a lack of command. Overall, he has been pretty good in limited action but has yet to see meaningful innings. He will likely relinquish the long relief role to Cristhian Martinez in the end.
Cory Gearrin: Gearrin has already set a career high by appearing in 36 games so far in 2013, which could affect him in the second half of the season. While Gearrin has been effective this season (3.30), he showed some weakness when he gained more responsibility. Still, he will have value in the bullpen in the middle innings and situations that call for a right-hand specialist.
Craig Kimbrel: Kimbrel is continuing to prove to be one of the most dominant closers in the game. Kimbrel has a 1.53 ERA and is second in the National League with 22 saves. He hasn't blown a save since May 7 against the Cincinnati Reds. Kimbrel will likely not have a historic season as he did in 2012, but I do think he'll finish the year with the most saves in the National League and will blow just one more save in 2013. He currently trails Jason Grilli of the Pittsburgh Pirates who has 26 saves.
*Cristhian Martinez: The Braves placed Martinez on the disabled list in mid-April with a shoulder injury, and he is currently on a rehab assignment in Mississippi. I think Martinez will make it back to Atlanta at some point in 2013 and regain the role of long-reliever—something he has had success with in the past few seasons.
Anthony Varvaro: Varvaro has also set a career high with 31 appearances in 2013. Manager Fredi Gonzalez has rewarded Varvaro for his good pitching (3.08) with an increased role out of the bullpen. Varvaro has appeared in the seventh inning or later in every game he's pitched in June and has posted three holds during that time. He has yet to put together a complete season at the MLB level, so expect a drop-off in effectiveness as the year grows on and the games get more important.
Jordan Walden: Walden has stepped up in the absence of Eric O'Flaherty to take over the set-up role for the Braves. In June, he has allowed no runs and just two hits in 10.2 innings while striking out nine batters to two walks. Walden has not been affected by the pressure of the eighth inning as he has past closer experience. However, his unorthodox delivery leads me to believe he'll go through a period of inconsistency in the second half with more possible arm issues.
Alex Wood: One of the Braves' brightest pitching prospects was forced into the bullpen due to injuries, and the young, left-hander has held his own. However, Wood projects to be a starter long-term and needs to go back to the minors to continues his development. At some point in July, expect him to be sent back to the minors to make room for another bullpen arm and be back in Atlanta as a September call-up when the rosters expand.