Per Terry Ryan, according to Rhett Bollinger via Twitter. Baker is on the 15-day Disabled List, retroactive to March 27. Bollinger also reports that Jason Marquis is "improbable" to be ready for the season. (Sounds like his daughter's injuries are more serious than I thought.) Liam Hendriks appears to be the favorite to start against the Orioles on April 8, and it appears that Anthony Swarzak will start some games.