Matsuzaka pitched three-plus innings in his second rehab start with Triple-A Pawtucket.
Matsuzaka allowed four runs (one earned) on five hits against Lehigh Valley. He struck out three against one walk and threw 75 pitches, an increase from his 47-pitch outing on Monday.
The right-hander left the game with the bases loaded in the fourth inning. Matsuzaka, recovering from a right upper trapezius strain, reached 92 mph on his fastball.
Bailey made his third rehab appearance, this time with Double-A Portland. His previous two outings came with the Gulf Coast League Red Sox.
On the mend from right thumb surgery, Bailey threw 27 pitches in an inning of relief against Erie. He entered the game in the seventh and allowed one run on three hits. Bailey struck out two and reached 94 mph on his fastball, mixing in a cutter and curveball.
Fellow injured reliever Rich Hill is not ready for a rehab assignment, but the left-hander threw a bullpen session at Fenway Park before Sunday's series finale against the Twins. Hill has been on the 60-day disabled list since June 10 with a left elbow strain.
"He looked good, felt good," said Red Sox manager Bobby Valentine. "[He] shouldn't be that far [from a rehab assignment], but there's no definite schedule, I don't think."