Doug Fister made his first rehab start with Class A Potomac on Sunday and said he "felt strong" after allowing six hits over four innings.

Fister has been on the disabled list all season. He dealt with elbow inflammation in early spring, and suffered a lat strain near the end of spring training.

"No discomfort," he said. "No anything. Felt loose where I needed it to be."

He's expected to make his next, and final, rehab start on Friday with Double-A Harrisburg.