Former U.S. Open champion Juan Martin del Potro will undergo surgery on his left wrist Monday and is expected to be sidelined for at least several months. Del Potro said his wrist has bothered him off and on for two years. In a statement on his Facebook page, del Potro said the latest operation was scheduled following an examination Sunday. The operation will be performed by Dr. Richard Berger of Rochester, Minn., who also performed the earlier surgery. More...