Derek Holland will be out the next 4-6 weeks with a "sub scapular strain," per the beat guys on Twitter.
Holland, who made his season debut today, left after just a single inning with what was obviously a physical issue. With Holland not throwing for at least a month, the Rangers are probably looking at Holland not being back until June or July.
The Rangers came into this season hoping that a rotation headed up by Yu Darvish and Derek Holland could help them contend in the A.L. West. Instead, Yu Darvish is out for the season after undergoing Tommy John surgery, and Holland is now potentially out for much of the first half of the season.
With Holland now unavailable, the Rangers' rotation consists of Yovani Gallardo, Colby Lewis, Ross Detwiler and Nick Martinez. Anthony Ranaudo pitched for Round Rock yesterday, and would seem to be the most likely candidate to be called up to replace Holland in the rotation, although newly-signed Wandy Rodriguez is also a possibility. 2013 first rounder Chi Chi Gonzalez had a strong spring and is also a possible candidate, although I suspect the Rangers want to get him some starts in AAA before bringing him up.
I'm a lot less confident about the 2015 season than I was at the beginning of the week.