Roger Federer left the O2 Arena on Friday via the London Underground after declaring that he would like the ATP final to remain on site after 2020 unless there is a convincing case to move the tournament.
The Swiss then traveled on the Jubilee line from North Greenwich to Westminster along with his fellow competitors on their way to the Houses of Parliament for the official launch of the tournament.
Federer has won two of his six records at the event in East London, where the prestigious season maker of the ATP has been in full swing since 2009.
Despite the popularity of the location in London with fans and players, the ATP announced in August that it invited bids from other host cities for 2021 and later.
Roger Federer (right) and Novak Djokovic (left) took a trip on the London Jubilee line on Friday
Federer took a selfie with the other players who participated in the ATP World Tour Finals
The tennis stars left from North Greenwich, which serves the O2 Arena in East London
Their destination was Westminster and the Houses of Parliament for the official opening party
I think that if they continue (in London) it is definitely a good choice, the 37-year-old 20-time Grand Slam champion Friday told a new conference when he prepared for his 16th appearance.
& # 39; I do not know what the options are. But if the O2 & # 39; s happy and the crowds continue to come massively to this location and the Tour has a good deal, of course why not stay here?
& # 39; I see no reason to change, unless there is someone else, a city that really wants it bad and is willing to come in and support the Tour in an important way for many years, like what we saw with Shanghai and perhaps also with London at the beginning. It has been a winning formula here. & # 39;
The ATP final, as it is now known, began in 1970 in Tokyo and spent six years on the road for a period of 13 years in New York and a six-year stay in Frankfurt for spells in Hanover, Lisbon, Sydney, Houston and Shanghai.
Since then, it has established its roots in London, where a cumulative 2.3 million fans flew to the site en masse for a week's event.
Novak Djokovic, who also arrived at the Friday media event on the subway, returns to the O2 as the world number 1. Djokovic won the title in London from 2012-15, and although the location served him well, he believes that a step away from London in 2021 must now be considered by the gentleman's tour.
I do not want it to come from London, but I just feel that the concept of this event is that it is one that travels, & # 39; the Serb told the reporters. & # 39; It is the biggest event that the ATP owns, the eight best players in a unique round-robin system.
& # 39; I think this is a great opportunity to promote tennis around the world. I just feel 10 years in one place is a bit too much. It has nothing to do with London or the event.
& # 39; I have had phenomenal success here and I should be the last to discuss it. & # 39;
World Bank No. 2 Federer said he would be in favor of the event that will remain in London after 2020
Djokovic, who wore a hat and gloves before getting on the train, had a slightly different opinion
(From left to right) Marin Cilic, Dominic Thiem, Kevin Anderson, John Isner, Federer, Alexander Zverev, Djokovic and Kei Nishikori posed for a photo on the North Greenwich platform