Swiss player Roger Federer overcomes Stefanos Tsitsipas 6-4 6-4 in Dubai final.
The 21-year-old German won his third title of the year and the ninth of his career by defeating Australian teen Alex De Minaur 6-2, 6-4 in the 50th edition of the US Open tuneup event.
After reaching semi-finals in Rotterdam, the 36-year-old Swiss surpasses American Andre Agassi who was the previous oldest man to top the ATP rankings at the age of 33.
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