Phil Klein

Klein made the team out of spring training but spent most of the year shuttling between Texas and Triple-A Round Rock, walking 10 batters against just 12 strikeouts in 17.1 major-league innings and walking 27 batters in 63.2 innings at Triple-A. Control has been an issue for him throughout his professional career, save for a brief stint at Triple-A at the end of the 2014 season, and it will likely continue to be a limiting factor going forward. The Texas bullpen is stacked from the right side, made even deeper with the acquisition of Tim Wilhelmsen in November, so there's not much room for Klein to carve out a significant role with the Rangers.

Klein earned a September callup (and the subsequent 40-man roster spot) by dominating hitters at Double-A and Triple-A to begin the 2014 season. After control woes (7.4 BB/9) plagued him at Double-A in 2013, he cut his walk rate in half while repeating the level to begin last season before improving his walk rate even further (3.0 BB/9) at Triple-A. Standing at 6-foot-7, 260 pounds, Klein is physically imposing on the mound, but he doesn't completely overpower hitters, averaging 91.6 mph on his fastball after being promoted to Texas. His success down the stretch in Texas was fueled by a low BABIP (.195) and high LOB% (90.4%), making it unlikely he'll repeat having a sub-3.00 ERA barring a reduction in his walk rate. He'll likely head back to Triple-A to begin 2015, but Klein appears to be a gem for the Rangers, who rolled the dice on him as a 30th-round pick in 2011.