The then 19-year-old, who was seeded seventh for that tournament, defeated Frenchman Julien Boutter in the final to claim his first title.
So retirement is not part of the picture just yet: Federer still has fish to fry. Before this final, Djokovic had lost just one in 32 matches since the first match at Wimbledon in July. "Last year I couldn't be here, so it's nice to be able to do it again because this year I had to start farther back in the rankings".
"It would mean a lot to me", said Federer to BBC Sport on possibility of reaching 100 titles in London.
"I'm really happy that I've been playing really good tennis for the last couple of months after the U.S. Open and I hope I can have one more good week next week here", he said.
"I've watched it since I was a kid so to play here in this wonderful atmosphere and get a win, I couldn't be more happy". Against Kevin and Kei, I've had matches this year, which went both ways.
The two men, with 34 Grand Slams between them, are the twin titans at the season-ending event at London's O2 arena. What more can I ask for?
Trump says Macron’s call for European Army ‘very insulting’
Unfortunately, it seems that we can expect Trump to tweet rather than act over the next few days during his visit to France. The president was scheduled to pay tribute in a ceremony at the AisneMarne American Cemetery in Belleau, about 85 km.
It was an event that included the likes of Marat Safin and Yevgeny Kafelnikov, so victory represented a big step in the career of the promising young Swiss.
Accounting for Nadal and Andy Murray's absence and third-ranked Federer's ageing vulnerability, 18 November could see Djokovic lift the title to complete his "return" to the top of the game in a year in which he won two Grand Slam titles as well. Fans can continue relishing the rivalry among the three men who could each lay claim for being the greatest of all time.
While Alexander Zverev, Marin Čilić and Dominic Thiem, the other participants in London, will score those odd wins over these champions, they still don't have the mental strength to consistently rule the world of tennis. After scooping the Wimbledon title, Djokovic has won the Cincinnati Masters, US Open, Shanghai Masters and Paris Masters, making him the hot favourite to win the ATP Finals title. When I do that, I know I can beat anybody.
The ATP, the governing body of men's professional tennis, announced in August the opening of an worldwide tender process to determine the future location of the season finale featuring the world's best eight qualified singles players and doubles teams. 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.