Roger Federer will become the first man to win the end-of-season ATP World Tour Finals six times if he triumphs in this evening's final.
The 30-year-old faces Frenchman Jo-Wilfried Tsonga in what is also the Swiss's 100th career final.
"I'm shocked every time that I've reached so many finals or won against so many players or whatever record it is," said the 16-time Grand Slam champion.
"It strikes me and makes me obviously very happy and very proud that I've been able to do it for so many years at the highest of levels.
"It's obviously a special occasion for me playing my 100th final, possibly winning my 70th, winning my sixth at the World Tour Finals. There's a lot on the line, and in a way there's not. All I can do is try to play a good match against a dangerous player."
Victory for Federer would make it 70 wins out of 100 finals but it will not be easy against Tsonga, who came from two sets down in a memorable comeback at this year's Wimbledon championships.