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If today's game gets rained out, then presumably Martin Perez will start tomorrow, and Colby's return will be TBD once again.
The Rangers will need to make a 25 man roster move and a 40 man roster move to make room for Colby Lewis, and they still need to make a 25 man roster move to make room for Hector Noesi. Adrian Beltre going to the d.l. appears likely to be one 25 man roster move. The Rangers could DFA Pedro Figueroa (who is out of options) to open up a 25 and a 40 man roster spot, or the Rangers could option Shawn Tolleson and DFA a minor leaguer on the 40 man roster -- Cory Burns would seem to be the prime candidate -- to create room.