World No.1 Novak Djokovic insists he is focused on rounding off his spectacular season in style as he prepares to face old rival Rafael Nadal in an exhibition match in Bangkok.

The Serbian, who has won three Grand Slam titles in 2015 and reached the final of the French Open, is bidding to win the end-of-season ATP World Tour Finals event at the 02 in London for a fourth successive year.

But before the 28-year-old returns to London in November, he faces Spaniard Nadal and then travels to Shanghai for the Masters 1000 event in China.

Meanwhile, Nadal, who is ranked seventh in the world rankings, has praised the 10-time Grand Slam champion for his achievements this year.