Juan Martin del Potro to undergo wrist surgery . Argentine needs operation on left wrist . Del Potro has previously had surgery on his right wrist . Rafael Nadal is out of the Australian Open with a back injury and will not play in Madrid.
Juan Martin del Potro to undergo wrist surgery . Argentine needs operation on left wrist . Del Potro has previously had surgery on his right wrist . Problem resurfaced at January 's Australian Open .