ATP World Tour: In pictures

Photo: Tony O'Brien

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.

Photo: Tony O'Brien

Spain's Rafael Nadal in action during his match against Serbia's Novak Djokovic.

Photo: Suzanne Plunkett

Novak Djokovic will meet Roger Federer, for the 44th time, in the final.

Photo: Suzanne Plunkett

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.

Photo: Suzanne Plunkett

Stanislas Wawrinka throws his racquet during his semi-final match with Roger Federer.

Photo: Suzanne Plunkett

Roger Federer with Stanislas Wawrinka after their semi-final match.

Photo: Alex Morton

Novak Djokovic celebrates with the trophy after winning the Barclays ATP World Tour Finals against Roger Federer.

Photo: Suzanne Plunkett

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
 Livepic
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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.