In a game played in Allentown, Pa., Matsuzaka scattered six hits over 5 2/3 innings, walking none and striking out eight. He threw 99 pitches, 66 for strikes, and gave up four runs, three of which were earned.
Dice-K will return to Boston's rotation next week, most likely during the club's three-game series at Toronto, which starts Monday. The Red Sox have yet to say how they will finagle Matsuzaka into a rotation that already includes Josh Beckett, Jon Lester, John Lackey, Tim Wakefield and Clay Buchholz.
Matsuzaka started the season on the disabled list because of an upper back issue that slowed him at the beginning of Spring Training. He posted a 1.62 ERA in three games for Pawtucket, walking one and striking out 13.
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.