The Red Sox announced today that Alfredo Aceves will start against the Orioles on Thursday night, not Felix Doubront.
Aceves has a 2.31 ERA in 25 career appearances against the Orioles, all in relief. He also has good statistics against their hitters.
Doubront will presumably be pushed back to face the Rays on Friday night in place of John Lackey. Doubront is 2-1, 3.91 in seven career appearances against the Rays, four of them starts. He was 2-0, 4.32 in three starts last season.
So for now, the rotation likely looks like this:
Wednesday vs. Baltimore: Ryan Dempster
Thursday vs. Baltimore: Alfredo Aceves
Friday vs. Tampa Bay: Felix Doubront
Saturday vs. Tampa Bay: Jon Lester
Sunday vs. Tampa Bay: Clay Buchholz
Monday vs. Tampa Bay: Dempster