"Obviously, the best news would be nothing," said Martin, rated by MLB.com as the Phillies' No. 9 prospect in 2013. "But it's not surgery. Just rest it, rehab it and get back out there."
The injury leaves the Phillies' starting pitching depth much thinner than anticipated. Cole Hamels is behind schedule after feeling discomfort in his left shoulder in November. Jonathan Pettibone also is behind schedule after experiencing a recurrence of a shoulder issue he had last season.
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.