Daisuke Matsuzaka (elbow) is scheduled to make his next minor league rehab start Saturday with Triple-A Pawtucket.
He's slated to throw around 90 pitches. Dice-K owns a 2.70 ERA and 14/5 K/BB ratio in 13 1/3 innings over his first three rehab starts. His 30-day rehab window expires on May 23, though it's possible the Red Sox could activate him sooner. It's not clear how the roster will shake out, but now is the time to stash him in AL-only leagues.