Unseating Spain's Rafael Nadal, the 36-year-old reclaimed the top spot for the first time since October 29, 2012, reports Efe.
On Sunday, the 20-time Grand Slam champion defeated Grigor Dimitrov, who moved up to the fourth place, 6-2-6-2 in Rotterdam to win his 97th title.
Federer is three years older than previous record holder Andre Agassi of the United States.
Germany's Alexander Zverev fell to fifth place, while South Africa's Kevin Anderson jumped to ninth.
The current ATP rankings and point scores are as follows:
Rafael Nadal (Spain) 9,760 points
Marin Cilic (Croatia) 4,960
Grigor Dimitrov (Bulgaria) 4,635
Alexander Zverev (Germany) 4,450
Dominic Thiem (Austria) 4,220
David Goffin (Belgium) 3,280
Jack Sock (United States) 2,880
Kevin Anderson (South Africa) 2,825
Juan Martin del Potro (Argentina) 2,815.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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