Mark Lowe has been given every opportunity to make this Rangers team in spring training. He has late game experience, and has earned moderate success a few times throughout his career, offering the Rangers hope that he might be able to overcome the serious injury problems that he endured in 2010.
He has yet to appear fully recovered from the injury however, and has had an atrocious spring, getting battered to the tune of a 14.14 ERA. Lowe has allowed twice as many hits as innings pitched, raising concerns that he might not be able to make the team out of spring. Frankly, I don't see where he fits into the bullpen as currently constructed.
Michael Kirkman may find himself on the way back to AAA due to a glut of left-handers suddenly present in the Rangers' pitching mix. He has been a rotation hopeful throughout the spring, but the team has only handed him one start, a night on which he was pounded by the Padres.
Of course, one poor outing does not tell the entire story, but considering his age, and availability of a few remaining options, Kirkman very well may be the odd man out. With C.J. Wilson, Derek Holland and Matt Harrison all involved in the rotations battles, with only Wilson assured of a spot, Kirkman may have to bide his time in AAA.
There has recently been noise about Brett Tomko potentially making the squad. He has been a serviceable spot starter and long reliever for numerous teams throughout his career, but appears to be nearing the end of the road. He hasn't done anything to distinguish himself from the crowd in spring training, nor would I expect him to. Tomko is simply a league average or less pitcher, who may be able to help with a few spots starts over the course of the year, but will likely make no greater impact than that.
Mason Tobin, a Rule Five draft pick from the Cubs, has impressed in his limited action in spring, but to keep him on the big league squad, the Rangers would have to do so all year, and I don't see the odds working in his favor. He is a promising, hard-throwing righty, but I'm not sure he's proven enough to justify keeping him in the big leagues all year, following his recovery from Tommy John surgery.