Rafael Nadal admits: Very tough to become World No 1

The world number two can unseat Djokovic from the top spot with a good performance in Beijing, but the Serb will go into the tournament with confidence he can retain the title he won last year.

Rafael Nadal. Pic/AFP

Djokovic is unbeaten in three visits to the China Open, following up wins in 2009 and 2010 with victory over Jo-Wilfried Tsonga in last year's final.u00a0Spaniard Nadal has been in fine form since coming back from injury earlier this year, and defeated Djokovic at this month's US Open final.

But the 2004 champion in Beijing says overcoming Djokovic is no easy feat.u00a0"I know that my opponent is unbelievable. He's able to not lose many matches during the whole season and it will be very tough to become number one," Nadal said to reporters in Beijing.

"But if I am still playing the same way that I did the last couple of months, I hope to have my chance here or in the next few weeks."u00a0Djokovic is the top seed in Beijing, ahead of number two Nadal.u00a0