10. Robbie Ray LHP: As the center piece of the return Detroit got for Doug Fister, Robbie Ray, now adds to Arizona’s pitching depth, as he was also traded for last month. Although the left-hander lacks the arsenal that the previous four Arizona pitching prospects possess, he still projects to have the ability to stick as a back end starter in a Major League rotation. One thing to look for is the fact that he is a fly ball pitcher, which could cause him troubles pitching in Arizona. Ray has the potential to be helpful this year as he pitched 100 innings in Double-A last year, but even if he makes it to the Major Leagues, look for him to be limited to around 120 innings in 2015.