Sublime Djokovic crushes Nadal to set up Federer final

By Martyn Herman LONDON (Reuters) - A year late maybe, but the ATP World Tour Finals will get a fitting climax to the season on Sunday after world number one Novak Djokovic and Swiss maestro Roger Federer marched to consummate semi-final victories. Djokovic turned on the style to outclass old adversary Rafael Nadal 6-3 6-3 while in Saturday's evening session at a packed O2 Arena six-times champion Federer beat fellow Swiss Stanislas Wawrinka 7-5 6-3 with a masterly display. Federer, who had an u