Andy Murray's spectacular rise to the top of the men's rankings was made official Monday with the Scot topping the end of season ATP charts on 12,685 points.
Novak Djokovic, beaten by Murray in Sunday's ATP Tour Finals in London, must make do with ending 2016 in second on 11,780 points.
Murray had climbed to world number one for the first time a fortnight ago at the Paris Masters.
And he maintained his dynamic form at London's 02 Arena with an imperious 6-3, 6-4 victory over Djokovic to clinch his first Tour Finals.
Murray's triumph after a season which saw him win his second Wimbledon title and retain his Olympic crown stopped the Serb regaining top spot.
The 29-year-old Murray is the 17th man to hold the prestigious year-end number one berth since the inception of the ATP rankings in 1973.
He is the first player other than Djokovic, Roger Federer or Rafael Nadal, on the slide in ninth, to earn the honour since Andy Roddick in 2003.
Milos Raonic, beaten by Murray in the semi-finals in London, ends the year in third place with Stan Wawrinka in fourth and Kei Nishikori, brushed aside by Djokovic in Saturday's other semi, in fifth.
End-of-season ATP Rankings
1. Andy Murray (GBR) 12.685 pts
2. Novak Djokovic (SRB) 11.780
3. Milos Raonic (CAN) 5.450 (+1)
4. Stan Wawrinka (SUI) 5.315 (-1)
5. Kei Nishikori (JPN) 4.905
6. Marin Cilic (CRO) 3.650 (+1)
7. Gaël Monfils (FRA) 3.625 (-1)
8. Dominic Thiem (AUT) 3.415 (+1)
9. Rafael Nadal (ESP) 3.300 (-1)
10. Tomas Berdych (CZE) 3.060
11. David Goffin (BEL) 2.780
12. Jo-Wilfried Tsonga (FRA) 2.550
13. Nick Kyrgios (AUS) 2.460
14. Roberto Bautista (ESP) 2.350
15. Lucas Pouille (FRA) 2.156
16. Roger Federer (SUI) 2.130
17. Grigor Dimitrov (BUL) 2.035
18. Richard Gasquet (FRA) 1.885
19. John Isner (USA) 1.850
20. Ivo Karlovic (CRO) 1.795
Source: AFP
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