Novak Djokovic began his 311th week as the No 1 player in the men's rankings on Monday. Novak Djokovic on Monday set a new landmark of 311 weeks as world number one, surpassing Roger Federer whose hold on a record-equalling 20 Grand Slam titles is now firmly in the Serb's sights. The 33-year-old Djokovic, already the winner of 18 majors, has time on his side with Federer turning 40 in August. He is also a year younger than Rafael Nadal who also has