Clay Buchholz believes he's on track to return to the Boston Red Sox and start on Sept. 10.

Buchholz pitched 3 1/3 innings Friday night for Triple-A Pawtucket in his second of three scheduled minor league rehab starts.

"I felt really good," he said. "Tonight I was much more impressed with the velocity that I was able to sustain over the period I was out there, and getting over that hump of not really worrying about anything when I'm trying to get a fastball down and away to a righty and have something on it."

Buchholz is working his way back from a bursa-sac shoulder injury.