Roger Federer left the O2 Arena via theLondon Underground on Friday after the event.
The Swiss then traveled on the Jubilee line from the Greenwich to Westminster alongside his fellow competitors on their way to the Parliament.
Federer has won two of his record six titles at the event in London where the prestigious season-ender has been playing to packed crowds since 2009.
Despite the popularity of the London venue with fans and players alike, the ATP announced in August that was inviting bids from other host cities for 2021 onwards.
Roger Federer (right) and Novak Djokovic (left) took a trip on London's Jubilee line on Friday
Federer took a selfie with the ATP World Tour Finals
The tennis stars are departed from North Greenwich, which serves the O2 Arena in east London
Their destination was Westminster and the Houses of Parliament for the official launch party
'I think if they stay (in London) it's definitely a good choice,' the 37-year-old 20-times Grand Slam champion told a new conference on Friday as he prepared for his 16th appearance.
I do not know what the options are. But if the O2 is happy and the crowds keep flocking and coming to this venue and the tour has a good deal, obviously why not stay here?
I do I do unless do unless do unless do unless do unless unless unless, unless, unless unless unless unless unless unless unless unless unless unless unless unless unless unless unless unless unless unless and and and and and and and and and and and and and and and and and and and also maybe with London in the beginning. It's been a winning formula here. '
The ATP Finals, started in Tokyo in 1970 and spent six years on the road before a 13-year stint in New York and a six-year stay in Frankfurt before spells in Hanover, Lisbon, Sydney, Houston and Shanghai.
In London where a cumulative 2.3 million fans have flocked to the venue for the week-long event.
Novak Djokovic, who also came to the world's first event. 1. Djokovic won the title in London from 2012-15, and while the venue has served him well, he believes a move away from London in 2021 must now be considered by the men's Tour.
"I do not want to move from London," the Serb told reporters. It's the biggest event the ATP owns, the eight best players in a unique round-robin system.
I think this is a great opportunity to promote tennis all around the world. I just feel 10 years in one place is a bit too much. It's not anything to do with London or the event.
'I've had phenomenal success here and I should be the last one to talk about moving it.'
World No 2 Federer said he would be in favor of the event staying in London beyond 2020
Djokovic, who wore a slightly different opinion
(Left to right) Marin Cilic, Dominic Thiem, Kevin Anderson, John Isner, Federer, Alexander Zverev, Djokovic and Kei Nishikori posed for pictured on the North Greenwich platform