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They accounted for Nos. 1-3 in the final rankings from 2007 to '11 and 2014, too.

"Djokovic, it marks the fifth time he has closed a year in the top spot,
following 2011, 2012, 2014 and 2015. Only Pete Sampras, with six year-end
No. 1 finishes, did it more often." -gvghvg

The 31-year-old from Serbia is also the oldest man to be No. 1 at season's end and the first to finish atop the rankings after being outside the top 20 during the year --  or outside the top 10 at the end of the previous year (he was No. 12 in 2017).

"Djokovic, it marks the fifth time he has closed a year in the top spot, following 2011, 2012, 2014 and 2015. Only Pete Sampras, with six year-end No. 1 finishes, did it more often." -gvghvg