Del Potro has wrist injury, pulls out of Kooyong

MELBOURNE, Australia (AP) -U.S. Open champion Juan Martin Del Potro has a wrist injury that has forced him out of the Kooyong exhibition tournament just days before the start of the Australian Open.

Del Potro was scheduled to play a Friday semifinal against Jo-Wilfried Tsonga, but informed tournament director Colin Stubs that he would not be able to play.

It was not immediately clear how serious the injury was, or whether it would threaten his participation in the Australian Open, which begins Monday.

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In October at the Shanghai Masters, he retired in the second round against Jurgen Melzer because of right wrist tendinitis. Del Potro had already qualified for the season-ending championship in London, where he lost to Nikolay Davydenko in the November final.

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