ATP World Tour: In pictures

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Djokovic turned on the style to outclass old adversary Rafael Nadal 6-3, 6-3 in the first semi-final of the World ATP Tour at the O2 Arena, in London.
Spain's Rafael Nadal in action during his match against Serbia's Novak Djokovic.
Novak Djokovic will meet Roger Federer, for the 44th time, in the final.
Six-time champion Roger Federer saw off his Swiss compatriot Stan Wawrinka 7-5, 6-3 to set a final clash against Novak Djokovic. It will be the Swiss maestro's tenth final.
Stanislas Wawrinka throws his racquet during his semi-final match with Roger Federer.
Roger Federer with Stanislas Wawrinka after their semi-final match.
Novak Djokovic celebrates with the trophy after winning the Barclays ATP World Tour Finals against Roger Federer.
Tennis - Barclays ATP World Tour Finals - O2 Arena, London - 22/11/15
 Men's Singles Final - Serbia's Novak Djokovic and Switzerland's Roger Federer pose with their trophies after their match
 Reuters / Suzanne Plunkett
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