White Sox manager Rick Renteria said Melky Cabrera has been focused and “as relaxed as he has ever been” lately, and the veteran showed it Monday afternoon at Guaranteed Rate Field. Cabrera drove in four runs against the Red Sox, including the go-ahead single in the seventh, to give the White Sox a 5-4 victory in the opener of a three-game series. Cabrera also hit a three-run homer in the third off left-hander David Price, who was making his season debut after recovering from an elbow strain.