Josh Beckett's back went into spams while he was warming up for his spring training start on Saturday. He left the game and was replaced on the mound by Manny Delcarmen.
Back spasms can be a tricky thing. Sometimes it costs a player a couple of games and they are fine. There are other times where they linger throughout the season and creep up on a player at inopportune times. Don't worry too much about this affecting Beckett's performance in the regular season, he still has a good 3 weeks to be ready and healthy for the season.
*Updated March 10 Article Link*