Masterson Sent to Pen, Rotation Mostly In Place

Justin Masterson will be a reliever this season and most of the rotation is set. Beckett, Lester, Dice-K and Wake have all made the rotation with Penny and Buchholz competing for the 5th spot. It is Penny's job to lose according to Extra Bases:

The Red Sox are waiting on naming the fifth starter, who, because of a day off April 7, will not be needed until April 12. They need to see how Brad Penny, who is starting today against the Twins, comes through in his final two starts of the spring. Penny previously battled fatigue in his right shoulder, but he was stellar in his first start, in which he pitched three innings.