Novak Djokovic vs Rafael Nadal - tennis duel may have to wait until Paris

Tennis world number one Novak Djokovic may be forced to pull out of October's Shanghai ATP Masters 1000 as a result of a tear to a muscle in his back. World number 2 Rafael Nadal, whose tennis has been overshadowed by the Serb's incredible form in 2011, will finish 2011 with the Rakuten Japan Open, the Shanghai Masters and the BNP Paribas Masters in Paris.

Tennis fans will be keen to see the two current giants of the game match up again in a year that has seen Djokovic beat the Spaniard in all six encounters between the two, including the Wimbledon and US Open finals.

The Shanghai Rolex Masters returns to Shanghai for the third year from October 8-16. Shanghai is the highest-level tournament in the ATP world tour and although Djokovic is a major doubt, both Nadal and Scot Andy Murray - who beat Roger Federer in the Shanghai Masters final in 2010 - will compete for the 1,000 champion points.

Rafael Nadal, who has been second best to Djokovic all year, is keen to get back to his best but is adamant 2011 has still been a good year.

"I am not that arrogant to feel that a final is a bad result - I don't consider myself that good," he said after the US Open defeat to Djokovic. "I fight to be always there, I fight all the time to win every match. I lost six finals but I was there. I was in the final of Wimbledon and the final of the US Open and I fought at both of them."

Both Djokovic and Nadal are scheduled to play at the BNP Paribas Masters in Paris in November.

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