From Tony Jackson:
Blake DeWitt optioned to ABQ to make room for Castro
[DeWitt will] play mostly 2B, with a few games at SS and an occasional game at 3B, according to Joe Torre. The most important thing is that he will play, every day, with regular at-bats, which will allow him to continue to develop. Guessing this move was planned from opening day, just a matter of clearing a 40-man spot.
Don't shed a tear for Blake DeWitt. Although it must sting to be sent to the minors right before the home opener, it's more important for him to get regular work. And DeWitt, 23, has ridden the majors-minors elevator before.
Juan Castro, on the other hand, is a journeyman—and that's nothing to sneeze at. In fact, Castro broke into the majors with the Dodgers in 1995 and spent five seasons with the club. He's especially useful because he can play all four infield positions. Hard to argue with these moves.
Delwyn Young designated for assignment (Tony Jackson)