"I don't see a reason to change, unless there is somebody else, a city that really wants it badly and is willing to come in and really support the Tour in a major way for many years, like what we saw with Shanghai and also maybe with London in the beginning".
The Japanese player qualified for the tournament, which starts at the O2 arena on Sunday, as a result of the withdrawal of Juan Martin del Potro due to a right knee injury.
He marked down Djokovic as the favourite during his pre-tournament news conference on Friday.
Roger Federer, who is seeking his 100th career title, headlines the other group.
After admitting he returned too soon from elbow surgery in February, his game clicked into gear at Wimbledon where he beat Nadal in a classic semi-final then swept past Kevin Anderson to the title.
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Federer will have been buoyed by his battling performance against Djokovic in the semi-final of the Paris Masters last week but he still lost the match - his fourth consecutive defeat against Djokovic, with the Serb now leading their head-to-head 25-22. I just can't tell you how he's feeling'.
Until such a time when a generation racing up in the rear-view mirrors of Nadal, Djokovic and Federer proves itself to be more than just an illusion, the big guns are here to stay. He has chased only a few tennis records with genuine intent, including the men's mark for Grand Slam singles titles, which Pete Sampras once held with 14 and which Federer now owns with 20. Group Guga Kuerten features top seed Novak Djokovic, Alexander Zverev, Marin Cilic and John Isner.
British tennis superstar Andy Murray is still out of action after an injury ravaged 12 months. "Been pretty close throughout my career, but it never happened".
"Reflecting on what I've been through in the last year, it's quite a phenomenal achievement", Djokovic said after returning to the No 1 spot after two years. He's had an incredible second half to the year. I was playing with them in the weekend, which cost me much more.' Asked if people would remember him for not being able to win a Grand Slam, Ferrer replied: 'Well, sometimes, but it does not matter.
Anderson is the other debutant and will become the first South African in 23 years to grace the season-ender.
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