Simon overcame Argentina's Juan Martin del Potro, who won last week's Rotterdam Open, 6-4 6-3 with the second seed needing treatment on a thigh injury.

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After Granollers won the first set 6-3, Murray took a long injury break early in the second set, getting his left thigh and lower back massaged.

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For years it required a second operation, in which bone was harvested from the hip or thigh so that it could be used to paste two vertebrae together.

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