Novak Djokovic wins third consecutive title by walkover
Andy Murray steps in to play exhibition match
ATP Tour Finals - live!
Novak Djokovic won his third consecutive ATP World Tour Finals title on a walkover after Roger Federer pulled out ahead of the match.
The world No2 fought for almost three hours to defeat countryman Stan Wawrinka in the semi-finals on Saturday night, saving four match points, and did not leave the O2 Arena until the early hours of Sunday morning.
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