A person familiar with Juan Martin del Potro's plans tells The Associated Press that the 2009 U.S. Open champion will not defend his title at the year's last Grand Slam tournament.
The person spoke to the AP on Saturday on condition of anonymity because an official announcement has not been made.
Del Potro has not competed since January's Australian Open because of an injured right wrist that required surgery. He recently began practicing in hopes of playing at Flushing Meadows, where he won his first major championship by upsetting Roger Federer in the final.
Del Potro becomes only the third U.S. Open men's champion in the 42-year Open era to not defend his title. His withdrawal comes a day after No. 1-ranked Serena Williams pulled out, citing a foot injury.