Andy Murray must change his coach in order to beat the world's top players again, says Barry Cowan.
Pictures from the final day of action from the O2 as the ATP World Tour Finals came to an end for another year.
Novak Djokovic won his third consecutive ATP World Tour Finals title after Roger Federer pulled out through injury.
Novak Djokovic will take on Roger Federer in the final of the ATP Tour Finals after both had to dig deep in their semis.
Roger Federer saved four match points before beating Stan Wawrinka in the semi-finals of the ATP World Tour Finals.
Novak Djokovic remains on course for a hat-trick of ATP World Tour Finals titles in London after beating Kei Nishikori.
It's semi-finals day at the ATP World Tour Finals with Novak Djokovic taking on Kei Nishikori and Roger Federer facing Stan Wawrinka.
Stanislas Wawrinka qualified for the semi-finals of the ATP World Tour finals with a 6-3 4-6 6-3 victory over Marin Cilic.
The best pictures from Friday's action at the O2 Arena in London
Novak Djokovic secured the year-end world No 1 spot for the third time after a 6-2 6-2 victory against Tomas Berdych.
A forlorn Andy Murray admitted his thrashing against Roger Federer at the ATP World Tour Finals was 'tough to take'.
Andy Murray was knocked out of the ATP World Tour Finals in emphatic fashion after being thrashed 6-0 6-1 by Roger Federer.
Novak Djokovic will guarantee he will finish the year above Roger Federer at the top of the rankings with another win.
Novak Djokovic made it two wins from two at the ATP World Tour Finals, crushing Stan Wawrinka 6-3 6-0 at the O2 Arena.
Pictures from the fourth day of action from the O2 as the ATP Tour Finals continue, with Novak Djokovic in action.
Tomas Berdych gained revenge for Wimbledon and US Open defeats to Marin Cilic with victory at the ATP World Tour Finals.
Andy Murray faces Roger Federer at the ATP World Tour Finals with three players gunning for the semi-finals.
Andy Murray returned to winning ways at the ATP World Tour Finals following a 6-3 7-5 victory over Milos Raonic.
Roger Federer closed in on the semi-finals of the ATP World Tour Finals after beating Kei Nishikori 6-3 6-2 at the O2.
Novak Djokovic, Stanislas Wawrinka, Marin Cilic and Tomas Berdych all feature on Wednesday at the O2.
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