Watching the Rangers the last few years, I'm sure the starting lineup, as well as the order, will continue to rotate throughout the season.
Bradley, Botts, Cruse, lCat, Murphy and Byrd will all rotate in the LF/RF/DH spots. Right now Hamilton is in CF and the rest will keep being changed around until not only a player outperforms the others, but the whole team clicks. If they get on a good streak they'll stay consistent but if they lose a lot of games Washington will keep changing things up.
That said, Murphy has looked really good this spring and so far this season. Here's hoping for lightning in a bottle from him this year!