http://news.bbc.co.uk/sport2/hi/tennis/8693147.stmInjured Del Potro out of US Open
Del Potro is one of only two man to have beaten Federer in a Grand Slam event
Argentine Juan Martin del Potro will not defend his US Open title as he does not want to rush his recovery following surgery on his right wrist.
The US Open starts on 30 August, but Del Potro is targeting a possible return at the Paris Open in November.
"If all goes well, I'd return after the US Open," said the world number five.
"The tournament is and always will be very special for me, all my life but I don't want to rush things," added the 21-year-old.
Del Potro has suffered with tendinitis in his right wrist as far back as October and has not played since January's Australian Open.
He underwent surgery in Minnesota earlier in May before returning home to Tandil, Argentina, to recuperate.
His height a long arms make the lever action on his joints extreme - its going to be a hard road back for the big guy.
When he won the US Open last September, the Argentine became the first man other than Rafael Nadal to beat Roger Federer in the final of a Grand Slam tournament.
Del Potro suffered a recurrence of the original injury at the Kooyong exhibition event in the new year ahead of the Australian Open and continued to struggle with the problem at the Grand Slam event, losing in the fourth round to Marin Cilic.