Top seeded Novak Djokovic of Serbia edged arch-rival Roger Federer in straight sets on Monday to claim the title of the year-ending ATP World Tour Finals.

The second-seed Federer broke the Serb's first service to enjoying a flying 3-0 start in the opening set but Djokovic bounced back quickly to even the games.

The first set remained tight and had to come to the tiebreaker after Djokovic wasted a set point in the 10th game. The Swiss managed to save another set point in the tiebreaker before the top seed wrapped up the set 7-6 (8-6).

The second set seemed to be deja vu of the first one as the reigning champion Federer who swept the last two ATP finals titles in a row took a 2-0 early lead. However, Djokovic rallied back again to level it to 5-5.

After saving his own serving game to make it 6-5, the Serb never looked back until clinched the victory with a backhand winner.

"This is my first time to be in this position here in London at the tournament," said the Serb, who started 2012 with an Australian Open title.

"This success is tremendous, it's very satisfying for my team and myself to conclude this fantastic season with a World Tour Finals win. I never got to the finals of this tournament in London."

It was the second finals title Djokovic claimed after he managed the feat in 2008 in Shanghai, while the Swiss missed the chance to accomplish the third consecutive victory in the year-ending tournament.

In the doubles final played earlier, the six-seeded Spanish duo Marcel Granollers/Marc Lopez beat 5th seeds Mahesh Bhupathi/Rohan Bopanna of India 7-5, 3-6, 10-3.

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