LONDON, Nov. 14 (Xinhua) -- Novak Djokovic sealed year-end world No. 1 position for a third time after completing round-robin play with a 3-0 record at the ATP World Tour Finals here on Friday.
The 27-year-old Serbian, who also finished at the top in 2011 and 2012,defeated sixth seed tomas Berdych of Czech Republic 6-2, 6-2 in the day's match and qualified for the semifinals.
He has become the seventh player to finish year-end No. 1 on three occasions, following in the footsteps of Pete Sampras (6), Jimmy Connors and Roger Federer (5), Ivan Lendl and John McEnroe (4) and Rafael Nadal (3).
Chris Kermode, the ATP Executive Chairman and President, said, "Novak has had another outstanding season and is truly deserving of his place as No. 1."
Djokovic first topped the rankings on 4 July 2011, following his first Wimbledon triumph, and held the top spot for 53 weeks. He reclaimed No. 1 from Federer on 5 November 2012, before relinquishing it to Nadal on 7 October 2013.