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× Djokovic and Nadal vie for year-end supremacy at ATP Finals

Novak Djokovic can end his season with a flourish by equalling Roger Federer's record haul of six titles at the ATP Finals and pipping Rafael Nadal to the year-end number one spot.

Germany's Alexander Zverev shocked Djokovic in last year's final at London's O2 Arena but the Serbian will start as the firm favorite after cantering to victory at last week's Paris Masters.

Djokovic and Nadal have…