|2019 Nitto ATP Finals|
|Place: O2 Arena, London Dates: November 10-17|
|Roof: Watch live coverage of one match per day on BBC TV, BBC iPlayer and online; Listen on BBC Radio 5 Live Sports Extra; Live text on selected matches on the BBC Sport website and app. Click here for the Live Guide.|
Roger Federer says his crucial departure with Novak Djokovic in the ATP finals on Thursday is "a chance to get him back" for this year's Wimbledon final.
The pair have not met since Djokovic saved match points to win Wimbledon's longest final in July.
Those who win on Thursday will progress to the last four London season-finals, with the other eliminated in the round-robin stage.
"Personally, I'm excited to play Novak on Thursday," said Federer, 38.
The Wimbledon final lasted four hours and 57 minutes and was decided on the fifth set tie-break after Federer scored points in his final set serve.
Asked if he still had bitter memories of the loss, Swiss Federer said, "Let's find out, but I think everything was on my side.
"I think we can both get a little confidence out of the game. It's obviously a lot. I maybe a little less."
"But at the end of the day, I never expected to interpret it again.
"In fact, it's good for me to play it again, and maybe it will help to have a chance to get it back or whatever."
Djokovic, who has won his last four games against Federer, aims to equal the record of six ATP Finals titles in Switzerland.
The 32-year-old is also trying to replace Rafael Nadal as world number one, but is expected to win the tournament after the Spaniard saved points to defeat Daniil Medvedev on Wednesday.
Federer and Djokovic beat Matteo Berrettini in their group but lost to Austrian Dominic Thiem, meaning they must win on Thursday to make progress.
Former British number one Tim Henman says Djokovic is the favorite for the 48th match between the two who have won 36 Grand Slam titles among them.
"He has won some of his most recent encounters," said Henman.
"Federer looked better against Berrettini [than against Thiem] but he will have to improve his game again, but if anyone can, Roger can ".
Thiem and Stefanos Tsitsipas of Greece have already made their places in the semi-finals.
Great Britain's Joe Salisbury and US partner Rajeev Ram are in doubles again on Thursday against Lukasz Kubot and Marcelo Melo, with the winner advancing to the last four.