Clay Buchholz Suffers Setback in Rehab, Underwent MRI Wednesday (Video)

Clay Buchholz took part in his first bullpen session in eight days Wednesday, but it was a brief one. Buchholz cut the session short after just 18 pitches due to discomfort in his right trapezius muscle.

The Red Sox were hoping Buchholz could complete a pain-free bullpen session Wednesday and Friday, then make a minor-league rehab start next week. But after Wednesday’s session, Buchholz will have to wait a little longer to see exactly what is wrong in his shoulder.

Listen to The Boston Globe’s Peter Abraham talk about Buchholz’s setback in the video above.

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