By Peter Simpson
BEIJING (Reuters) - World number one Novak Djokovic has pulled out of next week's Shanghai Masters due to the back injury that also stopped him from defending his China Open title in Beijing.
"I am sorry not to be playing in Shanghai, one of my favorite tournaments, but I have not recovered yet from my injury," Djokovic said.
Djokovic, who won the Australian Open, Wimbledon and the U.S. Open this season as he dislodged Rafa Nadal from the top of the world rankings, aggravated a niggling injury in Serbia's Davis Cup tie with Argentina earlier this month.
The strain he felt in his win over Nadal in the U.S. Open final in New York became a rupture during his singles against Argentina's Juan Martin Del Potro, Djokovic retiring in anguish and sending the South Americans through to the final.
"I did another check this week and the results are not good so I need to continue my rehabilitation," he added.
Djokovic, who wears specially made kit emblazoned with dragons for his China tour, is a big hit with the crowds in the world's most populous country and his absence has been a huge disappointment.
(Editing by Peter Rutherford)