The world No 1 informed the tournament organizing committee that he has not yet fully recovered from the partial rupture of a muscle in his back, sustained during his landmark passage to the US Open title earlier this month.
Djokovic, who has a win-loss record of 64-3 for the year, later aggravated the injury while competing for Serbia in the Davis Cup, and was in tears as he was forced to retire against Juan Martin Del Potro.
"I won't risk the worsening of the injury and that's why it is hard to predict for how long I will rest," Djokovic said, revealing that he had not recovered as quickly as expected.
The Serb's ongoing stint on the sidelines calls into question whether he will recover in time to compete in the ATP Masters 1000 tournament in Shanghai, which has already suffered the withdrawal of Roger Federer.
Jiang Chen (not his real name), a 26-year-old public servant, got married on April 10. It took him two and half years to prepare. The couple and their parents spent a total of 1.2
Beijing and Mexico City have the worst traffic jams in the world, as record traffic levels take their toll on people's health, productivity and social life, a study said Wednesday.