Annabel Croft marvelled at Novak Djokovic's character after he won the ATP World Tour Finals.
Novak Djokovic completed a successful defence of his ATP World Tour Finals title with a 6-3 6-4 win over Rafael Nadal.
Novak Djokovic paid tribute to his support team after winning the ATP World Tour Finals.
Images from the final day of the season in London.
David Marrero and Fernando Verdasco upset top-seeded Bryan brothers to win the ATP World Tour finals doubles title.
Boris Becker expects Novak Djokovic to beat Rafael Nadal and win the ATP World Tour Finals.
Greg Rusedski says Rafael Nadal's depth was too much for Roger Federer to break down.
Motivation will not be in short supply when the 2013 ATP World Tour season ends with a bang at the O2 Arena on Monday.
Novak Djokovic set up a title showdown with Rafael Nadal with a 6-3 6-3 victory over Stanislas Wawrinka in London.
Rafael Nadal eyes a perfect end to a remarkable year after blazing his way into the final of the ATP World Tour Finals.
Pictures from semi-finals day at the ATP World Tour Finals.
Rafael Nadal swept into the final of the season-ending ATP World Tour Finals after powering past Roger Federer 7-5 6-3.
Defending champion Novak Djokovic takes on Stanislas Wawrinka for a place in the Barclays ATP World Tour Final.
Roger Federer hopes being the underdog can play to his advantage when he meets Rafael Nadal at the 02 on Sunday.
Novak Djokovic beat Richard Gasquet in three sets as he warmed up for Sunday's semi-final with a demanding workout.
Boris Becker says Roger Federer's win over Juan Martin Del Potro shows the tennis legend lives on
Roger Federer beat Juan Martin del Potro 4-6 7-6 (7-2) 7-5 to progress into the last four of the ATP World Tour Finals.
Pictures from the final day of the round-robin.
Roger Federer's resurgence will be put to the test when he faces Juan Martin del Potro at the ATP World Tour Finals.
Rafael Nadal beat Tomas Berdych to end the Czech's hopes of reaching the semi-finals at the ATP World Tour Finals.
All the best pictures from the fifth day of action at The O2 at the ATP World Tour Finals.
Stanislas Wawrinka secured his place in the semi-finals at the World Tour Finals after beating David Ferrer.
Noval Djokovic may be fiery but his mental strength is taking him to new heights, says Annabel Croft.
Rafael Nadal may have secured the No 1 ranking but Novak Djokovic looks set to be right on his tail in 2014.