Masterson allowed two runs on eight hits and one walk while striking out two in 4.2 innings in a rehab start for Double-A Portland. It was his second rehab start, after going on the disabled list May 13 with shoulder tendinitis. Masterson got his pitch count up to 80 and could remain in the minors for one more rehab start, manager John Farrell suggested to the Boston Globe. There's a chance he could pitch out of the bullpen once he returns.