Roger Federer said he was preparing to celebrate breaking Jimmy Connors' record for the most consecutive weeks as world number one after winning his third Masters Cup here on Sunday.
Federer, who will surpass Connors' 160 weeks on top on February 26, described the record as the most important of his career so far.
"I think that is definitely one of the big records I've broken, maybe the biggest so far in my career," he said.
"Yeah, I'm waiting for that date to come along, and then I'll celebrate it, not right now."
Federer first reached the top ranking in February 2004 and has now accumulated enough points to break Connors' record set from 1974-1977.
He beat James Blake in straight sets in Shanghai on Sunday to end his season at a staggering 92-5.
Federer's 29th consecutive win makes him the first man to bag three year-ending championships since Pete Sampras completed his haul of five in 1999.
The 25-year-old also becomes the first to surpass eight million dollars in season earnings, taking home 1,520,000 dollars to boost his year's total to 8,343,885 dollars.
"There's not much more I could have done. I gave myself the best possible chance basically at every event," he said.
"To come out like this, on top, I surprised even myself."