Novak Djokovic believes he has a very tough group at the ATP Finals as all the Tour's form players have been put in his path.
The world number one will face Alexander Zverev and Daniil Medvedev in Group Tokyo 1970, with both winning indoor titles in the lead-up to the event.
"Zverev and Medvedev are probably in the best form out of all of us indoors," Djokovic said. "Big serves, solid backhands, similar style.
"With the way they are playing, you have to be at your best in order to have a chance to win."
Debutant Diego Scwhartzman is the other man in Djokovic's group, but the Serbian is not going to be taking him for granted either.
"He never played on this court, but he doesn’t have any pressure to do well. This is probably the best season of his life.
"Fierce competitor, solid from both wings and one of the quickest on the Tour."
Djokovic has not won the ATP Finals since 2015 but he says that his desire for success in the event has certainly not dampened over the years.
"[Securing the] year end number one releases some of the pressure, but it doesn’t change what I am here for - I want this trophy as much as anybody here.
"I feel more comfortable and confident with the success I’ve had here."
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