The champion of London 12

Fed ex: Djokovic ends Federer's reign as king of the World Tour Finals

Novak Djokovic unthroned Roger Federer as the king of London's O2 Arena in a brilliant final at the Barclays ATP World Tour Finals.

Federer had won the last two titles at this elite end of season event and was looking to extend his record to seven triumphs in the tournament as a whole.

However, he went down 7-6 (8/6) 7-5 in two hours and 14 minutes, after failing to build on strong starts to both sets.

For world number one Djokovic, who saved two set points in the second set, it was the perfect way to end another stellar season and as undefeated champion he goes home with $1,760,000 in prize money.

It was only the fourth time the top two players in the world have played in the final since the inaugural tournament in 1970.

Federer and Djokovic had met 28 times previously, with the Swiss leading 16-12, while he had also won their two most recent matches, at Wimbledon and in Cincinnati in August.

In contrast, this was Djokovic's first final in London, although he did win the title the final year the tournament was held in Shanghai in 2008