The Rangers have promoted two pitchers from their minor league ranks to fill openings in the big league rotation.  Familiar fantasy face, Roy Oswalt, is one of the two.  The other is 23-year-old Justin Grimm, who debuted last week and was rather effective.  Grimm was having a nice campaign in Double-A — nothing eye-popping, but he was among the most efficient pitchers in the Texas League, which is surely why the Rangers are giving him a look.  I’m not so sure he’s worth the same look in the fantasy game, however.  He’s slotted to throw twice next week, so if you’re two-start streaming… whatever.  But he’s hardly rosterable outside of AL-Only formats.  What’s interesting to note here is that Grimm leaped over the Rangers’ top pitching prospect Martin Perez.  Perez had been having a lousy year in the PCL, so it’s not necessarily surprising that Grimm was given the nod, but the move seems to have ignited Perez.  He’s surrendered only two runs through his last two outings, one of those being a complete game (only 90 pitches, too).  Featuring a plus fastball with sneaky velocity, a plus-plus change, and a sharp curve, Perez has frontline stuff.  It’s hard to say how long the Rangers will have room for either Grimm or another arm, but if Perez continues this recent hot streak, I’m confident he’ll supplant Grimm.  Should that scenario come to pass, add Perez in all formats.