The Rangers claimed the 27-year-old Castellanos off waivers from the Red Sox back in December. Originally a 10th-round pick of the Cardinals in the 2008 draft, Castellanos was shipped to the Dodgers in the 2011 Rafael Furcal trade before being traded to the Red Sox this offseason. However, Boston designated him for assignment upon signing Mike Napoli, leading to his claim by the Rangers.
Though he's moved around quite a bit this offseason, Castellanos has an outstanding minor league track record. The Florida native is a career .291/.382/.525 hitter with 36 homers and 35 stolen bases in 848 Triple-A plate appearances. However, he's managed just a .171/.186/.390 batting line in an admittedly small sample size of 43 big league plate appearances.