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San Diego Padres starting pitcher Brandon Morrow throws against the Colorado Rockies in the first inning of a baseball game Saturday May2, 2015 in San Diego. (AP Photo/(Lenny Ignelzi)
Right-hander Brandon Morrow threw four scoreless innings in Double-A San Antonio's 1-0 loss to Arkansas on Tuesday, his first start on a rehab assignment meant to whip his right shoulder in shape.