Del Potro expects to miss US Open (AP)

Defending champion Juan Martin del Potro says he expects to miss the U.S. Open because of recent surgery on his right wrist. He said Wednesday he might return to the ATP Tour after the last of the four Grand Slam tournaments. The U.S. Open begins on Aug. 30. He also will miss the French Open, Wimbledon and Argentina's Davis Cup quarterfinal against Russia on July 9-11.