Novak Djokovic, Rafael Nadal and Roger Federer are the top three in the year-end ATP rankings for the first time since 2014.
It is the seventh time that trio of tennis greats is 1-2-3 to close a season.
Never before, though, had each spent some time in the top spot during the same year.
For the 31-year-old Djokovic, it marks the fifth time he has closed a year at No. 1, following 2011, 2012, 2014 and 2015. Only Pete Sampras, with six year-end No. 1 finishes, has more.
No. 2 Nadal concludes a season in the top two for the 10th time, trailing only Federer's 11.
No. 3 Federer is in the year-end top three for a record 14th time.
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