After putting on a good face for several days, Red Sox manager John Farrell has finally admitted that Koji Uehara may not be ready for Opening Day (April 6th in Philadelphia). Uehara has been suffering from right hamstring tightness—and has not pitched in a game since March 14th. As each new day passes without game action for the closer, his readiness for Opening Day becomes more doubtful. Said Farrell, "I think with each passing day he's not in a game, there's growing concern, concern in the sense, 'Will he be ready for April 6?' And we're just working through that."Edward Mujica is the likely replacement for Uehara until he can return.