New world number two Novak Djokovic continued his brilliant start to 2011 last night by upsetting top seed Rafael Nadal in the final of the BNP Paribas Open at Indian Wells.

The third-seeded Serbian's 4-6 6-3 6-2 victory over the Spaniard secured his third title of the year after triumphs at the Australian Open and in Dubai.

The win also extended Djokovic's unbeaten run to 20 matches, but the 23-year-old is not resting on his laurels.

'I don't think anybody is unbeatable,' he said.

'I do have the best period of my life on the tennis court, but nobody is invincible. Still you are just trying to play your best in each match you're playing.'

Djokovic, who will take over as world number two today from Roger Federer after defeating the Swiss in Saturday's semi-finals, added: 'I am playing with a lot of confidence. I'm feeling the ball well on the court. I'm very dedicated. I have a big will to win each match I'm playing on, so it will not stop here, definitely.

'I want to keep on going and keep on playing good tennis. Hopefully I can recover and get ready for Miami.'

Djokovic and Nadal traded breaks in the fifth and sixth games before Nadal broke decisively to lead 4-3 and then closed out the first set with a love service game.

However, the world number one lost all consistency on what had been a strong first serve and the Serbian broke to go 4-2 up in the second set.

He immediately relinquished the advantage by allowing Nadal to break back but hit back in game eight before converting his sixth set-point to level the match.

Buoyed by that success, Djokovic clinched two early breaks in the decider and wrapped up victory - his first in six attempts against Nadal in a tour-level final - with a love service game.

Nadal was gracious in defeat after being denied a third Indian Wells title.

'For me to come back after a while outside competition and play in the final is fantastic,' said the 24-year-old.

'I lost today but I think I lost against one of the greatest.'

He added: "The serve was the difference today, in my opinion.

'It's true I played with less intensity after the first set, but I think everything is because of the serve.'

In the women's final at Indian Wells, world number one Caroline Wozniacki of Denmark overcame a second-set blip to defeat French 15th seed Marion Bartoli 6-1 2-6 6-3.