Chia-Jen Lo

After a strong spring and success in the minor leagues, Lo earned his first promotion to the majors last July. The 27-year-old right-hander ripped off seven straight scoreless outings to begin his career before he was given the opportunity to close for the Astros. Lo registered two saves before three shaky outings forced the team to give Josh Fields a look in the role. Aside from those outings, Lo did a pretty good job, but he'll need to cut down on walks (13 in 19.1 innings) if he wants to pitch in more high-leverage situations for Houston this season.