Kelly shortened the arm action in his delivery last season when he was moved to the bullpen full time, Brian MacPherson of the Providence Journal reports. After moving to the pen, Kelly had a 1.02 ERA and 1.019 WHIP, striking out 21 and walking five over 17.2 innings.
Abad, who didn't pitch well after being acquired by Boston last season and was left off the postseason roster, was retained by the Red Sox because they recognize he can be an effective left-handed reliever, Peter Abraham of the Boston Globe reports.
Pomeranz (elbow) is focused on winning one of the two available spots in Boston's rotation, Jason Mastrodonato of the Boston Herald reports. The left-hander is one of three pitchers, along with Steven Wright (shoulder) and Eduardo Rodriguez (knee), competing for a rotation spot.
Shepherd is expected to start the season at Triple-A Pawtucket, but could help the Red Sox at some point this season after the team elected to take a look at him in spring training, Peter Abraham of the Boston Globe reports.
Kimbrel has been asked by the Red Sox to focus heavily on improving his command this spring, Jason Mastrodonato of the Boston Herald reports. Boston's closer walked 5.1 batters per nine innings in 2016.