The Serb could secure the top spot for the first time in two years at the Paris Masters and the odds have shortened on him again holding all four major titles at the same time
For all that the slams and Masters dominate the game and the headlines, the ultimate judgment of who is the best tennis player in the world boils down to the end-of-year rankings, one of the most rigorous tests of consistency and staying power in any sport.
At the moment Novak Djokovic lurks at No 2 – fully seven years after his annus mirabilis, when he looked unbeatable on all surfaces, and a little over 18 months since his career was in freefall.
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