LONDON — Novak Djokovic looked unstoppable when trouncing Kei Nishikori but for sheer swagger Roger Federer remains unrivalled as he demonstrated again when dismantling Tomas Berdych as the ATP World Tour Finals began on Sunday.
World number one Djokovic extended his latest winning sequence to 23 with a 6-1 6-1 hammering of world number eight Nishikori who was powerless to stop the rampant Serb.
Far from easing up with the finish of his best ever year a week away, Djokovic clearly wants to lay down a marker for next year's assault on the top silverware and showed Nishikori no mercy.