Andrew Miller (hamstring) walked four over 1 1/3 scoreless innings Thursday in his latest minor league rehab appearance with Triple-A Pawtucket. While Miller struck out three and didn't allow a run, he threw just 20 out of 50 pitches for strikes. The Red Sox were considering activating him after Thursday's appearance, but he'll likely need to show a little more consistency first. His 30-day rehab window closes on May 7, so there's no rush.