Rafael Nadal has ruled himself out of the upcoming Asian swing of the ATP Tour as he requires time off to rest the knee problem which hindered him at the US Open.
Nadal was forced to retire when two sets down to Juan Martin del Potro in their semi-final at flushing Meadows and now faces at least several more weeks on the sidelines, meaning he will miss both the China Open and the Shanghai Masters.
The Spaniard tweeted: "As you know I had to retire from the semi-final match at the US Open and this past Monday I was in Barcelona looking with the doctors the situation of my knee.
"While the discomfort in my knee is nothing new, we have decided together with my medical and technical team not to participate in the Asian tour to recover the knee the way we have always done."
The world number one is a two-time champion at the China Open, having also lost in the final in Beijing on two occasions.
He has yet to claim the title at the Shanghai Masters, having twice lost in the final - in 2009 to Nikolay Davydenko and last year to Roger Federer.
Nadal will hope to be able to return to action in time to feature at the ATP Tour Finals in London, which get under way at the O2 Arena on 12th November.
He has yet to taste success at the end-of-season show piece finale, having lost in the 2010 final to Roger Federer and the 2013 final to Novak Djokovic.
View all Tennis betting