Since wresting the world No.1 ranking away from Carlos Alcaraz with his US Open victory in September, Novak Djokovic has maintained his hold on that pole position.
As a result, the evergreen 36-year-old will end an eighth ATP season at the year-end No.1 – extending his own record.
He is also the oldest-ever year-end No.1, bettering one of his own records there, too.
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Sunday night’s victory over Holger Rune at the ATP Finals secured this latest milestone and means he will hit 400 total weeks as the world’s top-ranked man.
Currently in a record 399th career week at No.1, he will click over to 400 when next week’s ranking are released on 20 November.
“It means a lot," Djokovic said courtside.
"You could see there were a lot of emotions on the court. I could feel it. I was very eager to win tonight’s match, get that monkey off my back.
“I won Paris (Masters), which put me in a much better position rankings-wise, and I knew that coming into Turin all I have to do is win one match.
“Obviously a big objective, big goal is achieved. Everything else now is a bonus.”
Djokovic bookended his season beautifully, beginning by going undefeated in Australia and ending it with the top ranking.
The Serbian’s titles at the Adelaide International and Australian Open – the latter an extraordinary 10th triumph at Melbourne Park – were the start of a 15-match winning streak to open the season.
Four months later, he won a third title at Roland Garros, a men’s record 23rd major singles title. It elevated him above rival Rafael Nadal, who owns 22.
Since losing the Wimbledon final in five sets to Alcaraz, he has not lost again. Djokovic extended his latest streak to 19 matches by defeating Rune in a three-hour thriller to open his ATP Finals campaign in Turin.
That streak incorporates his seven wins in New York, which earned him a 24th Grand Slam title.
Incredibly, he came within a set of sweeping all four major titles in a calendar year.
“I don't even know in which stages of my career I am anymore,” Djokovic smiled after his Paris Masters victory, “but I think that every win on a big tournament maybe the value is double nowadays.
“I'm going for whatever I can go for. I'm very close. I think I need one win to clinch the year No.1, so that was the biggest goal other than Davis Cup for the end of the year.”
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With one of those two goals already achieved, Djokovic will target a second straight ATP Finals crown and seventh overall, before representing Serbia at next week’s Davis Cup Finals in Malaga.
The ATP player with the next highest number of year-end No.1 finishes is Pete Sampras, with six.
Nadal, Roger Federer and Jimmy Connors each did so five times.