New Delhi, March 8 -- Serbian Tennis Star Novak Djokovic has broken Roger Federer's record of most weeks at number 1. This is now the 311th week of Djokovic at the number 1 spot in ATP men's rankings.

Djokovic, regarded as one of the greatest players of all time, has finished as year-end No. 1 on six occasions, an Open Era record shared with Pete Sampras. Djokovic has won 18 Grand Slam men's singles titles and 82 ATP singles titles overall, including a record nine Australian Open titles and a record 36 Masters events. He is the only player to win all of the elite tournaments on the modern ATP Tour - that is, all four Grand Slam tournaments, all nine ATP Masters events.

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